Nikki travels to Mexico following the violent death of her friend in a carjacking.
A horrific discovery pits Nikki and Jack against a killer preying on illegal immigrants.
Nikki and Jack are at the centre of a media storm when a young schoolteacher disappears.
Nikki and Jack are at the centre of a media storm when a young schoolteacher disappears.
Nikki and Jack are at the centre of a media storm when a young schoolteacher disappears.
Having discovered a link between their cases, the team stumbles on a 20-year-old clue.
Having discovered a link between their cases, the team stumbles on a 20-year-old clue.
A body found in the Thames leads Nikki and Jack to a riverside community scarred by grief.
A body found in the Thames leads Nikki and Jack to a riverside community scarred by grief.
Nikki is blamed for leaking police information, while suspect Aaron goes to ground.
Nikki is blamed for leaking police information, while suspect Aaron goes to ground.
Clarissa's husband Max is brought to the Lyell Centre to help crack a case.
Clarissa's husband Max is brought to the Lyell Centre to help crack a case.
The team find unexpected connections between the death of a former US ambassador in a plane crash and the apparent suicide of a successful businessman.
The team discover a connection between the plane crash and a sinister online forum. Meanwhile, Matt is grieving for his friend, putting his relationship with Nikki under strain.
When the body of a missing teenager is found in a field near his village, Nikki and the Lyell team must determine whether the killer is a stranger or a local.
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.
A post-mortem on a victim of domestic violence brings back troubling memories for Nikki.
When the team's search for Jenny's killer hits a wall, her friends at the women's refuge seek answers. Meanwhile, Thomas makes some friends in high places.
The Lyell team identify the concrete-encased remains as those of Derek Marshall, survived by his wife Sue and sister Ann. Clarissa traces payments to a cryogenics facility, leading…
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.
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.
With Nikki locked in a struggle for survival, Jack faces the biggest choice of his life.
The team find unexpected connections between the death of a former US ambassador in a plane crash and the apparent suicide of a successful businessman.
The team discover a connection between the plane crash and a sinister online forum. Meanwhile, Matt is grieving for his friend, putting his relationship with Nikki under strain.
When the body of a missing teenager is found in a field near his village, Nikki and the Lyell team must determine whether the killer is a stranger or a local.
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.
A post-mortem on a victim of domestic violence brings back troubling memories for Nikki.
When the team's search for Jenny's killer hits a wall, her friends at the women's refuge seek answers. Meanwhile, Thomas makes some friends in high places.