Inspector Hornleigh was the first of three lively British crime films inspired by the popular BBC radio serial "Monday Night at Eight." Hornleigh is played by Gordon Harker, while Alastair Sim assumes the comic-relief responsibilities inherent in the character of Sergeant Bingham. The "maguffin" in this film is a set of bags stolen from the Chancellor of the Exchequer, which Hornleigh and Bingham set about to retrieve. The principal suspect is an unscrupulous millionaire who hopes to corner the British stock market. Based on characters created by Hans Wolgang Priwin, Inspector Hornleigh inspired two cinematic sequels, both filmed in 1939.