True crime series that examines some of the most notorious murderers in the United Kingdom. Each episode focuses on an infamous case in Britain, and looks into what exactly drove the killers to commit their crimes. Perpetrators who are profiled in the show include Ian Huntley, Mick Philpott, Levi Bellfield, and Stuart Hazell. As well as outlining the background behind each case, the series features interviews with family members and friends of victims. Forensic pathologists and reporters also add their own expert knowledge.