Jack Hawkins
Supt Tom Halliday
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.
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
Detective Inspector at Chester
Colonel Blenkinsop
The Young Workman - Stanley James
The Young Workman's Wife - Mrs. James
Detective Inspector at Shipping Office
Cashier at Shipping Office
Detective Constable in Hospital Ward
House Surgeon
Director
