Biographer Brian Masters becomes obsessed with the motives of serial killer Dennis Nilsen.
David Tennant Dennis Nilsen
Daniel Mays DCI Peter Jay
Jason Watkins Brian Masters
Barry Ward DI Steve McCusker
Bronagh Waugh Charlotte Proctor
Jamie Parker Allan Green QC
Pip Torrens Ivan Lawrence QC
Laurie Kynaston Carl Stottor
Chanel Cresswell Lesley Mead
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