
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.
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Supt Tom Halliday

Sergeant Ward

Mary Halliday
Tony Halliday

Police Constable in Information Room

Detective Sergeant in 'Q' car

Nightwatchman / Gilson
Deputy Commander

Chief Superintendent Jim Malcolm

Stone

Creasey

Slob
Directed by Charles Frend · Released · 1956-06-01