The untraceable caller who says 'Remember you must die'
In 1950s London, the elderly Dame Lettie Colston and her circle, including her brother Godfrey, his wife Charmian and retired Chief Inspector Henry Mortimer, each receive an anonymous phone call saying 'Remember you must die.' Each recipient describes a different voice, and the police can never trace it. Mortimer concludes that the caller is, in effect, Death itself. Lettie, obsessed with catching the caller, is later bludgeoned to death by a burglar in her own home.