Dennis Andrew Nilsen was a Scottish serial killer and necrophile who murdered at least twelve young men and boys between 1978 and 1983 in London. We delve into the psychology of Dennis to try and understand what turned him into such a cruel necrophile and murderer.

In What Makes A Killer, we delve into the dark psychology of psychopathy - the personality disorder that drives some of the world's most notorious killers. Through the harrowing cases of Fred and Rose West, Ted Bundy, and Brian Cohee Jr., experts including psychologist Dr. Peter Hughes, psychiatrist Dr. Sohom Das, forensic specialist Dr. Jeane Gerard, criminologist Jane Carter Woodrow, and crime author Geoffrey Wansell unravel what lies behind the mask of charm, control, and cruelty.