The story of one of the most infamous cases in UK criminal history, that of serial killer Dennis Nilsen. Told through the prism of three men, the series explores the personal and professional consequences of coming into contact with a man like Nilsen.

David Tennant, Daniel Mays, Jason Watkins, Ron Cook, Faye McKeever, Barry Ward, Ben Bailey Smith, Alex Bhat, Jay Simpson, Bronagh Waugh, Joel Morris, Laurie Kynaston, Alexander Bhat