Silent Witness

The Lyell team investigate another gruesome murder, and the identity of the shooter at the restaurant leads to an unsettling discovery.

When six people are slaughtered by an unknown gunman, Nikki and Jack must work against the clock to find the shooter. Can they find him in time before he kills again?

When more passengers become infected on the plane, Nikki and the Lyell team must work to uncover the truth and find a cure before it�s too late.

When a mysterious contagion starts to spread on a flight from Mumbai, Dr Nikki Alexander faces a race against time - at 30,000 feet - to contain a deadly illness.

Nikki conducts an unusual post-mortem, and a terrifying discovery disturbs the team. DNA evidence forces the Lyell to seek advice from an unexpected quarter.

Dismembered body parts take Nikki into the crumbling world of criminal justice. Can the Lyell team find a missing barrister before it�s too late?

After another hammer attack, the Lyell team start uncovering connections to a conspiracy involving local government.

When a man is found bludgeoned by a hammer, the Lyell are drawn deep into a conspiracy involving local government.

Benjamin continues his desperate search for Gloria. Nikki�s disturbing discovery joins the dots. A new team member joins the Lyell.

The death of an elderly woman found in a cave has the Lyell team asking what drives a person to murder someone so vulnerable. A new boss at the Lyell riles Jack.

There are further twists ahead for Nikki, Jack and the team as they work with the police to explore multiple avenues to solve a 20-year-old case.

The Lyell are called to King's Cross Station Museum, where they discover the bodies of eight victims entombed below. With the knowledge that a prolific serial killer was operating in London nearly 20 years ago, Nikki and the team know this will be a case like no other.

Nikki has a breakthrough and edges ever closer to the truth as they confront a key witness. Who can the team believe and, more importantly, who can they trust?

The team investigate the death of a Burmese man on a deserted beach, whose young pregnant wife desperately hopes is still alive. Nikki and Jack piece together the perplexing crime scene and find it poses more questions than it answers.

Nikki and Jack work to uncover the truth surrounding a death and consider if it�s linked to their original body. Meanwhile, DI Torres searches for a stalker, and Cara is shocked at Velvy�s living conditions. As the case comes to a head, there are surprises afoot for the team.

A mummified corpse, undiscovered for a year, is found in a flat. The team strive to uncover its identity and are drawn into a murky world of drugs and botched plastic surgery.

Events continue to spiral at the university, and Cara becomes collateral damage. The riddle of the body in the Thames is solved. A breakthrough in the Cherry case is received from an unlikely source, but will the team get there before it is too late?

The team pieces together the mystery of a man found dead on the shore of the Thames, while the life of a disgruntled criminology professor begins to unravel.

When a woman�s body is removed from a reservoir, Nikki performs the post-mortem and confirms she is the deceased wife of pathologist Charles Beck. Jack and Velvy discover new evidence that leads to a surprising arrest as Nikki continues to seek the truth about notorious serial killer Calvin Dunn.

A new murder victim forces the team to consider whether a notorious serial killer has resurfaced after 20 years, or if they are dealing with a copycat.

As the evidence mounts against the accused police officer, the local CID finds dissent within their ranks. The Lyell team unveil corruption and deceit within the local jurisdiction, with deadly and wide-reaching consequences.

Jack is sucked into a complex case where he�s pitted against his former mentor. The tight-knit group of police officers provide a difficult case where nothing is as it seems.

The Lyell team return to the crime scene as another victim is in peril. Family ties are tested to their limits as they reveal the dark secrets that led to the tunnel collapse, and Jack is put in a difficult position when a blast from the past comes to visit.

Levelling-up leaders and environmental activists clash in a small town trying to look to the future. With a sabotaged train and a dead mayor, the activists become suspects.

The investigation continues to take unexpected turns, with Nikki managing to get behind the mask of the lead suspect. Jack has a breakthrough at the festival site and Nikki takes a dangerous opportunity. A surprise event at the Lyell brings some hope.

The Lyell team are thrown into the dark side of social media, where nothing is as it seems, and the perfect profiles of the influencers they are investigating raise disturbing questions. As a heavily pregnant DI asks the team for their expertise, are they running out of time to solve this case?

The Lyell team work together to find out why the lorry was found with bodies inside and a dead driver at the wheel, and are truly shocked to discover where it leads them. Gabriel becomes emotionally invested and is presented with an ethical dilemma, and Jack gets a surprise visit.

A lorry is found with people locked inside, some dead. With the survivors refusing to speak, Nikki and the team must use their pathological and forensic skills to identify them.

Nikki becomes even more involved with the Ndrangheta mafia-group and Jack uncovers some disturbing leads. An unlikely alliance leads Nikki closer to the truth, but not without some collateral damage.

When a man plummets from a high-rise building, the Lyell team cross paths with the NCA and a notorious mafia group, pushing Nikki to make a tough decision.

Events lead Nikki to conclude that getting the truth will put the Lyell team and everything they love in danger.

The death of an investigative journalist throws the spotlight on to Sam Ryan. Nikki begins to realise that the implications of her discoveries will challenge the principles of forensic science.

A secret from his father propels Jack to Belfast. Meanwhile, Simone and Nikki investigate the mystery of a burned body. As familial secrets come to the surface, Jack faces tragedy head on.

When a woman confesses to murdering her husband, the Lyell team must determine if all is as it seems. Meanwhile, Simone is shocked to be reunited with a detective from her childhood and struggles to untangle her past.

DNA evidence linked to the Health Secretary�s assassination forces Nikki to face her past in the present. As her investigation progresses, Nikki realises that its consequences will affect her, and her profession, forever.

Sam Ryan recruits the Lyell team to investigate the assassination of the health secretary, but Nikki is unsure whether Sam knows more than she's letting on.

Stranded in the flooded care home, Jack and Simone fight to keep the residents alive - but Nikki discovers that they may be trapped inside with the killer.

Nikki�s students make an alarming discovery while dissecting a body donated for their training. Jack and Simone try to save care home residents from a flood.

Jack, Nikki, and Simone investigate another death connected to the underground boxing ring. Jack's loyalty is tested when he fears Ryan has put Cara in danger.

The murder of a promising boxer draws Nikki and Jack into the world of underground boxing. Jack�s brother Ryan is released from prison.

With their suspect in a coma and an attacker seemingly at large in the hospital, Nikki calls on Adam�s expertise to help solve the case.

Nikki, Jack, and Adam investigate the murder of a surgeon in a hospital. DNA evidence appears to implicate a patient who was under anaesthetic at the time of the killing.

Having traced Laura�s last movements to a suburban house, the team work to identify the bodies buried in the garden. Jack must choose between his brother and the truth.

In the first case for new recruit Adam, the murder of a swimming instructor leads the team to suspect her ex-boyfriend, a former cop. Jack has an unexpected visitor.

As the team investigate a second death, Nikki�s theory starts to fall apart.

While investigating a suspicious death in a prison, Nikki focuses her attention on the victim�s cellmate, a dangerous criminal from her past.

Jack is rushed to hospital after collapsing at the scene of a car crash. Thomas discovers that soldier John Sealy may have been exposed to a nerve agent.

Thomas investigates the case of John Sealy, a soldier who died during a military training exercise involving exposure to CS gas. It appears John died from an aneurysm, but when Thomas discovers the trace of a possible nerve agent in his system, the family are desperate for answers.

The team's investigation leads them to a mysterious cryogenics facility and the discovery of another suspicious death.

When a skeleton is found in concrete, the Lyell team must investigate a suspicious death dating back 20 years.

Nikki determines that Jenny must have died before making contact with the tracks. But when the search for Jenny�s killer hits a wall, her friends at the women�s refuge seek answers. Meanwhile, Thomas�s political ambitions lead him to make friends in high places. Offers are made to open all the right doors for Thomas, but what do they want in return?

The body of a woman is found on railway tracks in London, badly damaged from electrical burns. On the mortuary slab, the woman�s recent and historic injuries suggest years of abuse, likely within the home. It�s a difficult post-mortem for Nikki, as she is troubled by memories from her childhood.

Investigating the murder of a teenage boy, Nikki and her team are forced to question police methods. Although Thomas discovers evidence that throws the time of death into doubt, DCI Claire Ashby seems more concerned with building the case against her main suspect. With pressure building on the police to secure a conviction, the Lyell team must fight to ensure that inconvenient truths aren't overlooked. Meanwhile, Clarissa notes a troubling parallel with a case from the start of her career. Is the real murderer still out there?

When a body is found in a field near the village of Hartford, Nikki and the Lyell team confirm it is that of missing teenager Jason Forbes. Working to the theory that most killers strike close to home, the ambitious DCI Claire Ashby is committed to proving the guilt of her main suspect, local locksmith Malcolm Wilde.

Nikki and the Lyell team continue to investigate the plane crash, ruling out an explosion and engine failure. Suspicion turns to Rowan Cole, the so-called Deadhead - a non-flying pilot who was hitching a lift back when his intended flight was cancelled. The investigation takes a turn when they discover a connection to a sinister online forum. Nikki�s partner Matt is grieving following the death of his close friend, putting their relationship under strain.

A private jet crashes into woodland outside London. Its passengers include the former US ambassador, Jonathan Kraft. Nikki calls her partner Matt from the crash scene to break the news - his friend and former colleague did not survive the accident. Matt is desperate for answers. When Thomas is called to an apparent suicide of a successful businessman, he finds unexpected connections to the plane crash. Are they dealing with a coordinated attack?

When Thomas sides against her findings on a controversial case, Nikki suspects foul play and takes steps to prove her theory. Jack and Clarissa follow a forensic trail connecting a dead researcher with a billionaire scientist and a secret testing programme.

Nikki is humiliated in court when a barrister accuses her of making a serious error in the case of a policeman who may or may not have been murdered. The team investigates the death of a medical researcher found in a canal with mysterious puncture marks on his body.

While the team searches for the killer, Jack works alongside an old friend who has dedicated her life to exposing the suspected organisation. They realise they have uncovered a complex conflict sustained by ties of loyalty, family and retribution.

A shocking incident on a suburban street brings back painful memories for Jack, forcing him to revisit his past. As a member of the victim's family seeks justice of their own, forensic evidence discovered by the Lyell suggests the involvement of a Northern Irish terrorist group, long-thought inactive.

With the remains of a second tattooed victim appearing in a Brighton recycling plant, it seems the Lyell team is on the trail of a serial killer. Working closely with local detectives DI Taramelli and DS Quicke, they must painstakingly piece together the evidence, and unearth the connections between a diverse range of suspects.

During a heatwave in Brighton, the Lyell team is summoned to a waste dump where a body part has been found. The search is on to recover the other dismembered remains and piece together the victim's body, which is covered in intricate Japanese tattoos. Nikki has some news that she desperately wants to share with Matt, but must wait until he visits from America.

When a gang of dealers recruit young men to push spice and fentanyl near a London school, head teacher Noah Taylor has no choice but to confront them. DI Kate Ashton leads the police investigation, and as well as tracking down those responsible for the recent deaths, Ashton also seems keen to pursue the possibility of a relationship with Jack. When the pair search a suspect's flat, Jack gets caught up in a rising tide of violence, which culminates in several deaths. Nikki, Thomas, Jack and Clarissa must work to find those responsible before it's too late.

After a teenage boy is killed in a meth lab explosion, his inspirational head teacher Noah Taylor resolves to confront the drug dealers preying on his community. Dangerous batches of new drugs are hitting the streets, and the effects are evident to Nikki, Jack, Clarissa, and Thomas as they deal with the rise in both violent and accidental deaths linked to the narcotics, while tragedy strikes at the heart of the Taylor family.

A mistake has been made during the course of the investigation, and Thomas is targeted as a scapegoat. Thomas must rally the team to find the killer before they strike again.

Fresh from her trip to the States, Nikki (Emilia Fox) and the Lyell unit are called in to investigate an attack against a trans man. When two further attacks are reported, one leaving a potential witness, it becomes clear that the team is facing an outbreak of violence against the trans community.

As the truth behind the McMorris family is revealed, the team is brought together by the conclusion of a shocking Christmas family tragedy. Reuniting with their respective families, Nikki finds her secret Santa gift is a visit from a loved one.

It is Christmas morning and Nikki is awaiting a call from Matt who is back in the States. Instead, she receives a call to say that the team is needed: a family has been massacred at an enormous property owned by Andy McMorris, the CEO of a haulage company. Greeted by SIO DI Gibbs, Nikki is first on the scene whilst Clarissa is connected to the action via screens and microphones back at the Lyell. Having left his father to celebrate Christmas without him, Jack is just arriving to join them when a gunshot suddenly rings out. With Gibbs lying on the floor with a life-threatening injury, the team realise that the shooter might still be on the grounds. Are they also in danger?

The team are determined to uncover the truth about unexplained deaths of patients at a care home. They are desperate to rescue Serena and return her to safety. Unbeknownst to her colleagues in the Lyell Centre, Clarissa allows herself to be admitted to the care home in order to investigate. Her determination to find out what happened at the care home leads her to uncover a shocking truth, but puts her life in danger.

While two care home staff are chasing Kevin McDowd, a young man with learning disabilities and sociopathic tendencies, Nikki and Jack examine a fatal road accident where the deceased is Kevin McDowd's mother. The investigation led by police sergeant Button should be straightforward, but the forensic evidence suggests foul play.

Nikki is still in shock as the team arrive at Matt's residence but insists on working at the Lyell, determined to help. When analysing crime scene photos and the positions of the victims' bodies, Nikki realises there is a pattern. Together, the team uncover a secret that has been held by those at the very top of the US government.

A US diplomat is shot dead in central London, forcing the team to work closely with the embassy and the FBI.

Nikki comes face-to-face with Simon Laing once again as the motive for the murders appears to be blackmail. The hospital computer database has been hacked and Clarissa and Max follow the forensic clues to a teenage hacker called Splinter. The danger comes much closer to home, however, when Nikki receives a threatening text with a picture of Rosie.

A woman is murdered and the forensic evidence takes the team to a cosmetic clinic where the victim had been receiving various treatments seemingly for free, but Nikki and Silva are frustrated by the CEO of Hamilton Ashe hospital when he blocks access to Karen's medical records. Meanwhile, when his daughter Rosie turns up at the Lyell as her mum is in hospital over a pregnancy complication, Thomas must play the doting father for a few weeks - a role that does not come naturally.

Nikki's suspicions about David Cannon are roused further when she discovers blood in the boot of his car an with Thomas's support she takes samples to process. Does it belong to Sally Vaughn? Meanwhile, the uncovering of the body from the 16-year-old murder shines the spotlight on three people who went to the same school. Emilia Fox stars, with Julian Rhind-Tutt and Alex Macqueen.

Nikki struggles to come to terms with life back home and seeks out fellow pathologist Sally Vaughan for support, only to learn she is nowhere to be found. National Crime Agency investigator Guy Bernhardt asks Nikki to help him by employing pathologist David Cannon, the chief suspect in Sally's disappearance. As Jack, Clarissa and Thomas share concerns about Nikki's wellbeing, a body found in a reservoir is linked to a murder case from 16 years previously. Return of the crime drama, starring Emilia Fox, with Julian Rhind-Tutt and Alex Macqueen.

With Nikki locked in a struggle for survival, Jack must use all of his abilities to track her down. When a mysterious person calls to make demands in return for Nikki's release, Jack's moral principles are put to the test. And with life and death in the balance, every decision counts.

Nikki travels to Mexico when her friend is killed in a carjacking, but she soon makes a discovery that sets her on a collision course with some dangerous and unpredictable forces. Thomas sends Jack to bring Nikki back, but soon he is knee-deep in the unfolding situation.

Nikki helps Becky come to terms with her trauma. Jack is paranoid that Clarissa will leave the Lyell Centre. Paul is in way over his head.

When an East End father and son are killed in a shocking road accident, Nikki and Jack find themselves working alongside a police officer with a vendetta. Clarissa summons her husband Max, a digital forensics expert, to help crack the case - and uncovers disturbing video evidence.

Nikki is under fire for leaking information on a suspect, and Thomas is called in to play peacemaker. Jack and DI Ashton track down the mystery witness. Before the killer strikes again, the team must uncover the true story of Ruth Tresize's disappearance three years earlier.

A woman's body found floating in the Thames leads Nikki and Jack to a community on the banks of the River Lee. Three years ago a teenager called Ruth Tresize went missing from the area, leaving the locals haunted by suspicion and grief. A fresh spate of killings reopens these old wounds.

Having found a link between the two cases, the team struggles to make sense of it. Nikki visits a disgraced former colleague who may hold the key. Thomas uncovers the bizarre truth about how Tina died.

When a photogenic young schoolteacher goes missing, Jack and Nikki are called to the scene and quickly find themselves at the centre of a media storm. Meanwhile, Thomas fights a lone crusade for justice for a troubled young woman who was killed in puzzling circumstances.

When Nikki, Jack and Thomas make a horrific discovery in the van, they are confronted with the work of a killer who preys on illegal immigrants. With the help of Clarissa, they must work out where the killer will strike next before more vulnerable people meet the same fate.

When a people smuggler is found dead in the City, Nikki must delve into London's illegal immigrant community. She meets a vulnerable Syrian teen called Akka who is in need of help, putting Nikki in a moral dilemma - and the killer is still on the loose.

Nikki and Jack are thrown into mortal danger as they uncover a high-powered world of sex and depravity. Meanwhile, Amy confronts her past.

A family murdered at a picnic leads the team to the female victim's estranged husband. But all is not what it seems, and Nikki and Jack are thrown into mortal danger.

Jack leads the hunt for suspected killer Bruno, the brother of the Polish teenager shot by the armed police, and enters London's small but devastating gun trade.

The fatal shooting of a teenager in an armed police operation triggers a series of murders that link gangsters, a grieving family and a fractured firearms unit.

After the team discovers that suspect Paul may not be who he says he is, the investigation revisits an infamous murder case from the past which he was involved in.

When an ex-convict is brutally murdered, the Lyell team is introduced to a forensic psychologist who works closely with those released from prison on life licence.

Thomas must put his personal feelings aside as the team track down Begovic before she and her extremist compatriots strike out again. It soon becomes clear that Begovic isn't working alone and may not have been the one who shot Ryman. In fact, her accomplice may be a man previously assumed dead.

A young British Muslim returns secretly to the UK, initially suspected of drug smuggling, but soon something much more sinister is feared.

Nikki becomes the prime suspect after a former colleague is murdered. Jack, Thomas and Clarissa fight to clear her name.

Nikki arrives at a murder scene to find it's a carbon copy of a case in her past. She soon fears the killings are personal to her.

When the body of local criminal Jason Simons is found, it reveals secrets that challenge his identity and the course of the case.

Admired Essex police officer Sergeant Sam Honeywell is found dead in his car and the Lyell team are under pressure to find his killer.

A young woman working for the Doshis is found dead in Maksim's apartment. Nikki and Jack unravel the mystery.

The nanny of a Russian oligarch is killed in a botched assassination attempt. Nikki, Jack and Thomas investigate.

Social worker Louise fears the worst when the estranged stepfather of a teenager whose case she managed is found dead in his car.

When a suspected paedophile is found murdered in a children's playground, the team link the death to a missing child case.

Nikki helps DI Luke Nelson unearth painful childhood memories. The team close in on the unrelenting tube-stalking killer.

When murders linked to the London underground take place, the accidental verdict in the first death is questioned.

As the sniper's threat widens, Nikki and Jack investigate links between the victims to close the net on the killer.

When three people are shot dead at a petrol station, Nikki and Jack strive to track down the sniper at large in London and stem a crisis.

Jack's loyalties to his brother and the team are torn when Hannah is found dead, forcing him into a dangerous solo quest for the truth.

The murder of a 15-year-old schoolgirl forces Jack to confront his troubled past, and alienates him from Nikki and the team.

Jack clashes with DI Brooke as he and Nikki hunt for the missing baby, and the sole eyewitness in the murder case is found dead.

The murder of a pregnant young woman found in a suitcase leaves Nikki, Jack and Thomas in a race against time to catch her killer.

Nikki, Jack and DS Ross find themselves under pressure to urgently close the net on a serial killer abducting young women.

Nikki and Jack head to Scotland to help an earnest rural detective investigate the murder of a lap dancer found in a remote forest.

Thomas and Jack's worst fears are realised when Nikki and lawyer Greg Walker are held hostage by Bennetto in a dangerous armed siege.

When Nikki's testimony frees a convicted killer, a new murder sees her lock horns with the detective who originally imprisoned the killer.

A businessman seeks revenge for the murder of his wife and son, as footballer Isaac fights to prove his innocence in the murder of a young woman.

A sex tape puts a top-flight footballer in the frame for murder, while new Lyell Centre boss Thomas struggles to impress Nikki, Jack and Clarissa.

Leo develops a life-changing relationship with a charity worker as Nikki and Jack make a forensic breakthrough on their case in Afghanistan.

Human remains found on an Afghan water supply project send Leo, Nikki and Jack to the war-torn region to establish if it is a missing British soldier.

Conflict brews between Leo and Nikki when he suspects her new boyfriend is involved in a 50-year cover-up, leaving Leo battling alone to expose the truth.

Nikki is wooed by a science minister as she and Jack investigate a murder on an eco-building project, whilst Leo finds himself trapped in a hospital siege.

When arrested and interrogated by DI Kate Warren, Alan Lane vehemently protests his innocence and insists he didn't kill his wife.

When a pub landlady is stabbed to death and her little finger cut off, Nikki is isolated in her quest to prove the husband's innocence.

As the basement women case highlights two cooperating killers, Nikki, Jack and DI Reed realise one victim was killed by a controlled sedative.

The murders of two women in a house basement force Jack to lock horns with an old flame, while Leo wrestles with providing a second post-mortem on a baby.

When two women close to a dead businessman are murdered, Nikki, Jack and Leo open his family's skeleton-packed closet.

The mysterious death of a wealthy confectionery firm owner plunges Nikki, Leo and new recruit Jack Hodgson into a murky world of corporate subterfuge.

Harry and Nikki make a crucial connection between the dead girls and sex-grooming victim Shannon, but is it too late for Hannah and Lauren?

Nikki stumbles across a sinister underworld where teenage girls are groomed for sex and forced into prostitution.

Nikki and Harry track down the Catholic nun behind the exorcism, only to find that John now believes he's possessed - but can he be saved?

Leo is determined to uncover the truth surrounding the mysterious death of a young girl who was being treated by his college friend Delaney.

While Harry and Nikki investigate DI Bridges, Leo puts himself in danger when he follows his instincts and trails violent prison officer Kessler.

Leo battles with the authorities at the notorious Redhill prison to seek justice for the murder of an ex-prison inspector.

Nikki is forced to confront manipulative serial killer Arnold Mears face-to-face in order to save Annie.

Nikki is approached to help identify the paltry remains of a serial killer's undiscovered victims.

Harry and Nikki discover more about the tangled lives of the inhabitants of Magnolia Drive.

A puzzling family murder in suburbia deeply affects Harry who has history with the family.

Harry and DI James deviate from the original investigation to secretly test DNA evidence from the rival Chesham laboratory to try to solve this stalled case.

When Leo's friend commits suicide, Harry and Nikki are called to the scene of a violent and calculated murder, which is thought to be the work of an apparently dormant serial killer.

When the Van Burens' au pair commits suicide, the pathologists start to unravel the truth behind the embassy shootings, and a dark family secret is exposed.

After a major incident at the Dutch Embassy, Harry and Nikki are removed from the case when the Dutch decide to appoint their own pathologist.

With Harry dead and Leo and Nikki getting nowhere with the police, the pathologists struggle to clear Harry's name, while the police seem intent on covering up a wider conspiracy.

When human rights lawyer Anna Sandor calls Harry to Budapest to investigate the death of a client, they start to uncover a sinister underworld conspiracy, putting both their lives in danger.

Having established that Lieutenant Lockford was murdered, Leo makes a startling breakthrough, and the investigation begins to unmask a dark secret at Hillsdon Army Base.

As Nikki investigates the drowning of a young mother, Harry is called to an apparent suicide at a nearby army base; it soon starts to look like the cases may be linked.

Leo investigates a potential copycat killing, but the team are starting to wonder if Karl Bentley was wrongly convicted, leaving the real murderer free to set out on a new killing spree.

Leo finds himself haunted by past memories when he returns to Sheffield after an ancient body is unearthed on Bleakston Moor.

Nikki's mental instability worsens, and Harry and Leo are forced to get her psychiatric help. But then when the true identity of the murderer is discovered, it becomes a race against time to save Nikki's life.

When the pathologists investigate three suspicious deaths in one night on the same ward, it looks like hospital staff may be behind their murders. Nikki becomes increasingly disturbed by a rape and murder case involving a young child.

Nikki is forced to make some hard choices when she discovers that Anton has been less than honest with her.

When a Zimbabwean asylum seeker is unfairly deported to South Africa, Leo needs to find a way to help her return to the UK.

Leo's postmortem of the victims reveals there were two guns used, and possibly a second shooter.

Nikki and Harry try to help wounded victims of a campus shooting while trapped in the building with the rampaging shooter.

With Danielle missing and her lover on the run, Leo and the police struggle to unravel a complex web of deceit.

Leo is concerned that the police are involved with a cover-up to protect a rogue undercover cop linked to the death of a young woman.

The revelation that Flannery's first wife also died of a stair fall sends Harry to Prague to seek evidence to prove the man's guilt. However, Nikki's determination to look beyond the police's blinkered investigation leads to further tragedy.

Harry and Nikki try to remain professional when they find themselves on opposite sides of a high-profile case, but it's not easy as they're both brilliant at what they do, and they soon show that every piece of evidence can be interpreted at least two ways.

Harry puts his career on the line to prove his lover's innocence after Leo is attacked and Levin turns up dead.

Leo comes under suspicion for fraud when an insurance investigator accuses him of falsifying a post-mortem report, and Harry falls for the charms of an attractive former colleague.

Nikki clashes with Zambian police as she investigates the death of a British medical student.

The team is asked to investigate the death of a British medical student in Zambia.

As the search for Liam continues, Nikki's loyalty towards her former mentor is tested.

When one boy is found dead and another is abducted, the team faces a race against time to find the missing child.

A second Hasidic boy is killed, which convinces Harry they are looking for a Jewish killer.

Harry is drawn into the murder of a Hasidic man found on disused wasteland, while Leo investigates the death of an Australian backpacker.

Nikki faces mounting police hostility to her investigation of the armed raid.

The team investigates an armed raid on a suspected terrorist cell in which two suspects and a police officer are killed.

Harry tangles with a Russian oligarch over the murder of a journalist.

The team investigates the murder of a woman found dumped on the side of the road with her face removed.

Frustration within the team builds as Harry and Nikki struggle to find any useful evidence from the post-mortems to help the police. No one will talk, and they have no leads. Leo worries for Levi, who is sucked further into a world of gangs and violence.

Leo does community service on a rough estate after being done for drink-driving.

Having fallen out with both the police and Clara's family, Nikki finds herself increasingly alone in her search for the killer.

When the bones of a young girl are found, everyone but Nikki is convinced it's a teenager who went missing two years ago.

Nikki grows increasingly worried that a mistake she made on a case four years ago may have contributed to the murder of a young woman.

Nikki revisits an emotive case from the past when a girl she proved innocent of murder is herself murdered.

With Nikki out of action and Alice's surgical team closing ranks, Harry and Leo dig deeper.

The murder of a John Doe leads the team to a hospital, where Nikki is investigating a top paediatric surgeon with an unusually high mortality rate.

Leo refuses to back down in his search for the killers of the young boy, despite threats and increasing racial tension.

When the mutilated body of a young boy is pulled from the river, Leo is determined to give him an identity and to bring his killers to justice.

Harry suspects the Ministry of Defence may be covering up the true cause of the helicopter crash, but he's determined to get to the truth.

Harry and Nikki are first on the scene when an RAF helicopter crashes, but Harry's search for answers brings him into conflict with the Ministry of Defence.

With Nikki missing, Harry works against the clock to find out who is responsible for the murders and finds himself in a cover-up.

Harry and Nikki are drawn into a war between a medical research establishment and a group determined to take direct action.

When a third killing takes place on school grounds, Leo races to find some connection between the apparently motiveless murders.

Memories of his own daughter's death are stirred up when Leo is called in to investigate the apparent suicide of a teenage girl.

Leo is puzzled by the strange death of conceptual artist Jimmy Triangle.

Harry and Nikki's friendship is rocked by the discovery of the body of Harry's ex-lover.

The team investigate a man who died on a night bus, an office prank gone tragically wrong and the suicide of a pro footballer.

The team investigates a hit-and-run accident, an arson and a woman who collapsed on her hen night.

The team follows the trail of the people traffickers, and has to find any remaining survivors before a highly contagious disease breaks.

When a boat carrying illegal passengers is found crashed in the Thames, the team investigate.

Harry discovers Nazim's death may not have been suicide. Is Dr Sanders the culprit? Meanwhile Leo investigates the murder of a bank manager.

A paranoid schizophrenic goes on a violent frenzy in a busy high street. When a young man from the same care home commits suicide, Nikki is convinced there is a connection.

Nikki's beliefs are put to the test as she realises they are facing murders that are committed for sheer pleasure.

The team is drawn into the investigation of a series of brutal, apparently motiveless murders in the academic world.

The man behind the bloodshed pits both factions against one another and the team are in a race against time.

The team is called to a drive-by shooting outside a London nightclub. They arrive to a scene of carnage with several people dead, or dying.

As the police infiltrate a gang of identity thieves, Leo faces a choice between justice and revenge.

When his wife and teenaged daughter are involved in a hit-and-run car crash, Leo begins a painful journey back to his native Sheffield.

Leo, Harry and Nikki step up their efforts to discover the truth behind the train crash but there are still many unanswered questions.

Leo and his team are approached by a support group to help discover the truth behind a train crash.

Foul play is confirmed when it emerges that both the horse and the helicopter pilot were drugged. Could syndicate member Matt Gibb be responsible?

The death of a jockey during a race becomes more complicated when the horse's owners are killed in a helicopter crash.

Leo hunts for the source of the children's symptoms before any more fatalities occur. Meanwhile Harry discovers the truth behind Nick Garner's death.

Suspicious symptoms afflicting a group of children on the coast may be linked to the death of a local man.

The case takes an interesting turn when the bodies are identified as brothers who disappeared after a police questioning during the Troubles.

The bodies of two young men are discovered, partially exposed, following a landslide on the coast of Northern Ireland.

Leo and Harry follow up their leads to discover an alarming truth. Are Sam and her team being used by the Home Office to drive out Peter Sachs in fear of a costly process?

The Home Office ask Sam and her team to examine a number of times of death as given by a highly respected and internationally renowned independent pathologist, Peter Sachs.

Following her discovery of the second body and believing the cases to be linked, Sam is sidelined from the investigation as she attempts to get to the truth.

The body of a young pregnant sports agent is found in the grounds of her office building. Sam and her team uncover a tragic story of money and corruption.

Sam uncovers a crippling truth about her involvement in a 13-year-old case -did she help convict an innocent man?

Sam comes under scrutiny at an official inquiry into two prison deaths and an old case Sam worked on 13 years ago resurfaces.

Sam delves deeper into the case but is undermined by the findings of an independent pathologist, brought in to conduct a second autopsy.

Sam is called after a suspected terrorist attack causes a fire at a hotel and a government minister is injured.

As the police investigate the possibility of a copycat killer among the students, a friend from the college pressures Sam to put loyalty above the truth as the case unfolds.

The murder of a probationary police officer leads the team to the doorstep of a police cadet college, as they quickly establish a link to a similar murder just months before.

As Sam searches for the killer of Marcus Saul, Harry finds himself involved in the tragic death of a student from the medical faculty.

Murder is suspected when the body of a missing person is found hidden within a derelict factory, seven years since he was last seen alive.

A new murder turns DCI Ashton's suspicions toward the victim's family and friends, whilst Harry investigates a death that may be linked to the Irons family.

The police bring in the team when a family is attacked in their own home, leaving the only survivors in critical condition.

Sam, Leo and Harry are at odds with the police investigators when a covert operation is exposed. But has Sam overstepped the mark this time?

Professor Leo Dalton and Dr Harry Cunningham join Sam Ryan in the investigation of a massive traffic accident in which not everything is as it seems.

A second post-mortem is performed on Helen Dupen and, although Sam is obviously ill, she is determined to find more evidence.

A school director's wife commits suicide, but Sam suspects murder. During the investigation, she receives shocking news about her own health.

DCI Norton dismisses Sam's idea that a serial killer is at work - until a third body is found at one of the victim's family homes.

Sam is called in to identify the naked body of a woman uncovered on a ski slope in Norway.

A third death helps Sam realise that the motive behind the murders of the Davies brothers was not racial - but revenge.

Two elderly brothers are found dead in their home, with no apparent injuries. A post mortem discovers suspicious puncture marks and a possible racist connection.

The identity of Body 10 reveals that a violent criminal may have been wrongly convicted of a murder. Sam and DCI Connor are eager to get the truth.

Sam searches for the identity of a victim of a cinema fire. A medical artist helps her reconstruct the face, but the result causes some embarrassment for the police.

Sam challenges the police after an indepenedent postmortem into McNally's apparent suicide. Further deaths take place.

A small-time criminal is the prime suspect in a gangland murder. Sam Ryan believes he may be innocent.

All Sam's skills are required when 10 more bodies are recovered from the North Sea, and the piecing together of the jigsaw of evidence begins in earnest with her pathology team.

Sam is called in by ex-Detective Inspector Leslie Peterson, now a Coroner's officer, who is investigating the ditching of a helicopter ferrying crew to a gas rig with 14 passengers and two crew on board.

Sam looks for connections between Ian Neal and a killing in Northern Ireland in 1985. Meanwhile DI Connor's wife arrives in Cambridge.

The death of a farmer involving a combine harvester seems like an accident - until Sam receives an anonymous tip-off.

Are the deaths linked to a drug war or is this the work of vigilantes? Sam suspects a personal tragedy is at the heart of things.

A tragic scene is discovered when a young mother apparently dies of an overdose. When another addict dies in an explosion, Sam has a bigger case on her hands.

The hunt is on for Mr Harris, but the murderer may be closer to home. Meanwhile, Sam grows closer to surgeon James Reynolds.

A young woman is found dead in an empty house. Why was she there? Sam suspects another person was involved.

The case becomes entangled in Annabelle's romantic relationships when Sam discovers her friend may have had an affair with a student.

Sam must investigate a case with a painful personal connection when a close friend is murdered after the Cambridge May Ball.

Sam's pursuit of her own theories leads her into dangerous places, both personally and professionally.

The police suspect a violent alcoholic of the murder of an elderly woman. Sam clashes with the police when she refuses to support their case.

The murderer makes a direct threat against Sam's life after she uncovers the evidence needed to identify them.

The murder of a married woman who was having an affair seems straightforward. Friction develops between Dr Ryan and the police when the evidence complicates their case.

The police make an arrest, but do they have the right suspect? Sam pursues her own line of investigation.

Stuart Evans is in the advanced stages of Aids when he dies, and his body is donated to science. However a routine toxicology test reveals foul play was at work.

Sam discovers why Kevin entered a bare knuckle fight, as well as uncovering evidence of more foul play in the boxing circuit.

A boxer dies from brain injuries mid-bout. A new DSI takes over the team's investigations. Sam and Wyn bury their mother.

Sam tries to persuade her student to reveal where her father is hiding. The tragedy spreads beyond the family, and even the team may be in danger.

Tragedy strikes after a student asks Sam for advice over her arranged marriage, and then sees her family torn apart.

Someone is harassing Sam as evidence of a cover-up mounts, and the bomb squad is called in to deal with a mysterious parcel.

The death of a man in custody seems like a straightforward case, but DS Farmer has concerns about some of her officers.

The police grow frustrated with the lack of a forensic link, but Sam finds more clues in an old case.

When Mark James's decomposing body is discovered, it bears all the signs of a ritualistic killing.

The murder investigation continues and someone breaks into Sam's house. Undeterred, she continues her search for the truth.

Dr Sam Ryan investigates her first case as a police consultant - a tragic case involving the death of a child.