
"The True Inside Story of Scotland Yard's Crime Busters!"
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

Secondhand Dealer

Police Constable Bates

Newspaper Circulation Manager
Mrs. Elliot / Mrs. Gilson

Welsh Police Constable
Welsh Newsagent's Daughter
Mr. Thomas

Official at Somerset House

House Agent at Shepperton

Housewife at Shepperton
Mrs. Stevens, the daily help

Detective Superintendent Ogilvie

Manager of Festival Hall

P.C. at Hospital (uncredited)

Detective (uncredited)

Urchin (uncredited)

Constable (uncredited)

Detective at Car Lot (uncredited)

Detective (uncredited)

Detective tailing Creasey (uncredited)
CID Man (uncredited)
Officer in Criminal Records Department (uncredited)

Unknown Role
Unknown Role
Unknown Role
Unknown Role
Unknown Role
Unknown Role
Unknown Role

Unknown Role
Unknown Role
Unknown Role
Unknown Role
Unknown Role
Unknown Role
Unknown Role

Unknown Role

Unknown Role
Unknown Role

Unknown Role
Unknown Role
Unknown Role
Unknown Role
Unknown Role
Unknown Role
Detective (uncredited)
Unknown Role