Dennis Nilsen (David Tennant, Doctor Who, Broadchurch) known as the "kindly killer" was an unassuming civil servant who spent five years murdering young men he met on the streets of Soho. When he was finally caught in 1983, Nilsen had murdered a total of fifteen men, making him Britain's most prolific serial killer of the time. 3 episodes, 2 ½ hours, 1 DVD or Blu-ray disc. SDH.