In February 1988, a 29-year-old John Duffy was on trial for the rape and murder of three women. He was a terrifying figure, and infamous across London. His arrest brought an end to a horrific four-year crime spree across the British capital, but he was only a half a murderous duo. Duffy refused to give up the name of his accomplice, and without any leads, the police have no choice but to wait. It would be another 15 years before the other man was found guilty for his part in the heinous crimes. Over a decade later, the imprisoned Duffy has had enough, and tells investigators he will testify against his former accomplice, and friend, David Mulcahy.

This episode is sponsored by: BetterHelp & Green Chef

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Original music by Ben Krejci, Lee Rosevere, Kai Engel, Kevin MacLeod, Sergey Cheremisinov, and Daniel Birch.