4. Episode 4
No release date yet
Colin Stagg (Sion Daniel Young) is awaiting trial for the murder of Rachel Nickell. But while he is on remand in prison, another horrific attack occurs in south London. Samantha Bissett and her four-year-old daughter have been brutally murdered in their basement flat. Having already played a major role in the case against Stagg, psychologist Paul Britton (Eddie Marsan) is again called in to assist with the new case. The two crimes bear some clear similarities and news of the murders destablises undercover officer Sadie Byrne (Niamh Algar). As the trial approaches it becomes clear that everything rests on her evidence and the highly controversial honeytrap she’s been a part of, the evidence against Colin Stagg is far from watertight. Is he really the killer they’ve all believed him to be or an entirely innocent man?
3. Episode 3
No release date yet
Officer Sadie Byrne, codename: Lizzie James (Niamh Algar), meets prime suspect Colin Stagg (Sion Daniel Young) for the first time. Believed to be a highly dangerous operation, she is closely watched by a team of armed fellow undercover officers in Hyde Park, her alias has been carefully shaped with psychologist, Paul Britton (Eddie Marsan), and Detective Inspector, Keith Peddar (Harry Treadaway). Soon after the pair meet, ‘Lizzie’ reveals a dark secret from her past, but it’s a ploy to gain Colin’s trust and make him feel comfortable enough to give away the secrets they believe he is hiding... About his supposed involvement in the UK’s biggest murder investigation. But as the weeks pass, Sadie is unable to crack him and it soon becomes clear that the pressure she’s under is starting to have a profound impact.
2. Episode 2
No release date yet
Based on a true story and set in 1992, we enter the world of Colin Stagg (Sion Daniel Young): the MET police’s prime suspect in the murder of Rachel Nickell. In their minds, Stagg perfectly fits the criminal profile of the killer and yet there’s no hard evidence linking him to the murder. Police hopes now rest on undercover officer, Sadie Byrne (Niamh Algar), who’s been exchanging a series of letters with the self-confessed, lonely Stagg under the alias “Lizzie James”. As she encourages him to write increasingly extreme sexual fantasies to her, it’s clear Stagg is starting to fall for ‘Lizzie’. And then, just as the operation appears to be gaining momentum, news of the honeytrap is leaked to the Press. Furious that this could compromise the investigation, Detective Inspector Keith Pedder (Harry Treadaway) has no choice but to accelerate things with a face-to-face meeting between ‘Lizzie’ and Colin Stagg, the suspect she believes is Britain’s most dangerous man.
1. Episode 1
No release date yet
It’s 1992, and Sadie Byrne (Niamh Algar) is a highly ambitious and successful undercover police officer with the Met Police. After playing the key role in a major drug bust, Sadie is predictably written out of the story by her male colleagues. And then, she’s suddenly given the chance to work on a case that could make her career. The devastating murder of a young mother on Wimbledon Common, in front of her two-year-old child, shocks the nation. The image of Rachel Nickell is on the front pages of nearly every newspaper and the coverage fuels a climate of fear. Catching the killer becomes a national obsession. That task falls on the shoulders of a newly-promoted detective, Inspector Keith Pedder (Harry Treadaway), but months into the inquiry, Pedder and his team are no further forward and the pressure is starting to build. Following a TV appeal, a suspect is named by members of the public: Colin Stagg (Sion Daniel Young). Pedder calls on the expertise of criminal profiler, Professor Paul Britton (Eddie Marsan), and together, they formulate an untested and dangerous undercover operation that will put Sadie Byrne front and centre. Under the alias “Lizzie James”, her job is to form a relationship with Colin Stagg in the hope that he will eventually reveal his part in Rachel’s murder.
