Examining the complicated and toxic sexual politics of the early ‘90s and the police’s obsession with the wrong man, Deceit enters a dysfunctional world, where a female undercover officer, codename ‘Lizzie James’, is asked to become sexual bait for a suspected killer.

Five months on from the crime, The Met Police are still no closer to capturing the man they’re convinced is responsible. First identified through a BBC Crimewatch appeal, the evidence points to Colin Stagg (Sion Daniel Young). The media feed a national obsession, covering every detail of the case and demanding justice. The police are determined to catch the man who, in their eyes, is guilty before he kills again. In desperation, the relatively young Detective Inspector leading the case, Keith Pedder (Harry Treadaway), engages the nation’s most famous criminal profiler, Paul Britton (Eddie Marsan), to help devise a bold undercover operation which will see an attractive, young female officer start a relationship with Colin Stagg.

Growing up under Thatcher’s reign, with second-wave feminism, ‘Lizzie James’ (Niamh Algar) is determined to rise through the ranks. But the early ‘90s has brought with it an inevitable backlash in the shape of ‘Lad Culture’, obliterating any feminist gains and putting women firmly back in their place, something felt by both ‘Lizzie’ and her friend and colleague Lucy.

Hugely ambitious, ‘Lizzie’ has found a way to stand out by becoming one of very few female undercover officers deployed in covert operations, in a team which includes her sometime confidant Baz (Nathaniel Martello-White) … But then she’s offered a central role in the biggest murder enquiry the country has ever seen…

With access to previously unheard audio, video and written materials, Deceit includes scenes of verbatim dialogue as part of a fictionalised retelling of events, taking viewers behind the scenes of one of the UK’s most flawed and controversial police investigations.