Explores the story of Britain's most infamous child murders by serial killers Ian Brady and Myra Hindley and features an eyewitness account of the last murder from Hindley's brother-in-law David Smith.

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

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