The Worsted Viper is a 1943 detective novel by the British writer Gladys Mitchell. It is the fifteenth in her long-running series featuring the psychoanalyst and amateur detective Mrs Bradley. Bradley was one of a number of investigators active during the Golden Age of Detective Fiction. Much of the novel takes place on the Norfolk Broads. In 2000 it was adapted for an episode of the television series The Mrs Bradley Mysteries starring Diana Rigg. Source: Wikipedia (en)