In 1966 Brady and Hindley are brought to court. Eyewitnesses describe the trial, as letters reveal the serial killers' carceral after lives as Britain's longest serving prisoners.

Police arrest Ian Brady for murder. A horrific tape recording and photos lead to a search on the moors, revealing a string of child victims, and Myra Hindley as an accomplice

The first episode features an eyewitness account of the last murder from Myra Hindley's brother-in-law David Smith, and contributions from 1960s pop singer Janie Jones, who befriended Hindley in prison and conducted a 40-year-long correspondence with both Hindley and Brady.