On 7 November 1974, a nanny named Sandra Rivett was bludgeoned to death in a Belgravia basement. A second woman, Veronica, Countess of Lucan, was also attacked. The man named in court as perpetrator of these crimes, Richard John Bingham, 7th Earl of Lucan, disappeared in the early hours of the following morning. The case, solved in the eyes of the law, has retained its fascination ever since. Laura Thompson narrates the story that led up to that cataclysmic event and re-examines the possible truths behind one of postwar Britain's most notorious murders.