
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.

as Supt Tom Halliday

as Sergeant Ward

as Mary Halliday

as Tony Halliday

as Police Constable in Information Room

as Detective Sergeant in 'Q' car

as Nightwatchman / Gilson

as Deputy Commander

as Chief Superintendent Jim Malcolm

as Stone

as Creasey

as Slob

as Detective Inspector at Chester

as Colonel Blenkinsop

as The Young Workman - Stanley James

as The Young Workman's Wife - Mrs. James

as Detective Inspector at Shipping Office

as Cashier at Shipping Office

as Detective Constable in Hospital Ward

as House Surgeon

as Secondhand Dealer

as Police Constable Bates

as Newspaper Circulation Manager

as Mrs. Elliot / Mrs. Gilson

as Welsh Police Constable

as Welsh Newsagent's Daughter

as Mr. Thomas

as Official at Somerset House

as House Agent at Shepperton

as Housewife at Shepperton

as Mrs. Stevens, the daily help

as Detective Superintendent Ogilvie

as Manager of Festival Hall

as P.C. at Hospital (uncredited)

as Detective (uncredited)

as Urchin (uncredited)

as Constable (uncredited)

as Detective at Car Lot (uncredited)

as Detective (uncredited)

as Detective tailing Creasey (uncredited)

as CID Man (uncredited)

as Officer in Criminal Records Department (uncredited)
























as Detective (uncredited)
