The Long Arm (1956) is a Mystery, Crime, Thriller film that follows scotland Yard detectives attempt to solve a spate of safe robberies across England beginning with clues found at the latest burglary in London. The film is notable for using a police procedural style made popular by Ealing in their 1950 film The Blue Lamp. It is known in the US as The Third Key. The Long Arm is not currently listed with streaming providers in your selected region, but availability can change over time. It has a user rating of 6.9 out of 10 from 21 votes. Fans of mystery movies may also want to explore similar titles below.