Former Detective Chief Superintendent Bob Booth recalls the hunt for serial killer Donald Neilson, known as the Black Panther, whose crimes culminated in the 1975 kidnapping and murder of teenage heiress Lesley Whittle. Footage and interviews are used to tell the story of Neilson's reign of terror and the police investigation into Whittle's kidnapping. Stylistic elements like music, sound effects, and production techniques are employed to construct an atmosphere of seriousness and realism around recounting this true crime case.