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.

Jack is rushed to hospital after collapsing at the scene of a car crash. As he fights for his life, the team must identify the poison to save their friend.

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.

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

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.

Nikki, Jack and DS Ross are feeling the pressure to close the net on a serial killer abducting young women. Concerns increase about missing Sarah, and solving her mysterious disappearance becomes an urgent priority for the team.

A family murdered at a picnic leads the team to the female victim's estranged husband.

As Nikki and Jack move closer to the truth, their lives are thrown into mortal danger.

Nikki continues to try and identify the last of the remaining bodies in an effort to uncover any connections and find motive, while Jack and the police begin to look into several two-decade old missing persons cases which might reveal the identity of the man dubbed “The King’s Cross Serial Killer”.

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.

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

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.

Investigating the murder of missing teenager Jason Forbes, Nikki and the Lyell team are pressured by police officers who are keen to secure a conviction.

Thomas performs a post-mortem on a soldier who died in military training. His investigation takes a turn when he discovers traces of a possible nerve agent.

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.

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

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

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.

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.

Nikki and Jack investigate a man killed by a train on the London underground.

Nikki helps high-flying DI Luke Nelson unearth painful childhood memories.

A suspected paedophile is found murdered in a children's playground.

Nikki, Jack and Thomas focus in on Lizzie's movements on the night of Barge's murder.

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

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