In 1983, Scottish serial killer Dennis Nilsen was arrested after the discovery of human remains which had blocked a drain near his London home.
Cast:David Tennant , Daniel Mays , Jason Watkins , Ron Cook , Barry Ward , Faye McKeever , Ben Bailey Smith , Bronagh Waugh , Jay Simpson , Alex Bhat , Joel Morris , Andy Jaye , Chanel Cresswell , Jonathan Coy , Oscar Salem , Cal MacAninch , Neil Edmond , Ross Anderson
On 9th February 1983, a grisly discovery alerts Hornsey Police to a serial killer, operating under their noses for years. DCI Peter Jay is stunned when meek Dennis 'Des' Nilsen freely admits to killing multiple men without knowing why.
As the investigation continues, bits and pieces fall into place. Des is interviewed in depth by a writer who is intent on penning a biography of the killer. DCI Peter Jay is frustrated by Scotland Yard's brass. The trial commences.