Trial and Error is a 1937 mystery detective novel by the British writer Anthony Berkeley. It was a loose sequel to the 1929 novel The Piccadilly Murder, featuring two of the characters from the earlier work the unprepossessing but shrewd Ambrose Chitterwick and Chief Inspector Moresby of Scotland Yard. Berkeley was a prominent author of the Golden Age of Detective Fiction, known for his inverted detective stories. Source: Wikipedia (en)