Seventeen years after leaving the Lyell, Sam Ryan returns asking for the team's help after a political assassination. When the credibility of DNA - the bedrock of forensic science - is challenged, everything the Lyell holds dear comes under threat. Uncertain of who to trust, the team fights to uncover the truth and protect everything they love.
- S25 E1 - History, Part 1July 11, 202252minIn Liverpool, following the launch of Sam Ryan’s new company, the health secretary is assassinated. Sam summons the Lyell team with a plea to help investigate, but Nikki is unsure whether she can trust Sam, who seems to know more than she’s revealing. Meanwhile, Jack and Nikki navigate their feelings for each other.Free trial of BritBox or buy
- S25 E2 - History, Part 2May 23, 202252minDNA 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.Free trial of BritBox or buy
- S25 E3 - History, Part 3May 29, 202251minWhen 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.Free trial of BritBox or buy
- S25 E4 - History, Part 4May 30, 202252minA 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.Free trial of BritBox or buy
- S25 E5 - History, Part 5June 5, 202252minThe 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.Free trial of BritBox or buy
- S25 E6 - History, Part 6June 6, 202252minAfter the fall out from the lorry crash, the team uncover evidence of a sophisticated plot. Events lead Nikki to conclude that getting the truth will put the Lyell team and everything they love in danger, including Sam Ryan.Free trial of BritBox or buy