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.
Director
Charles Frend
Jack Hawkins
Supt Tom Halliday
John Stratton
Sergeant Ward
Dorothy Alison
Mary Halliday
Sam Kydd
Police Constable in Information Room
Glyn Houston
Detective Sergeant in 'Q' car
Richard Leech
Nightwatchman / Gilson
Geoffrey Keen
Chief Superintendent Jim Malcolm
Sydney Tafler
Stone
Peter Burton
Creasey
George Rose
Slob
Arthur Rigby
Detective Inspector at Chester
Ralph Truman
Colonel Blenkinsop
Ian Bannen
The Young Workman - Stanley James
GB
