

01/06/1956
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.

Jack Hawkins
as Supt Tom Halliday

John Stratton
as Sergeant Ward

Dorothy Alison
as Mary Halliday

Michael Brooke
as Tony Halliday

Sam Kydd
as Police Constable in Information Room

Glyn Houston
as Detective Sergeant in 'Q' car

Richard Leech
as Nightwatchman / Gilson

Newton Blick
as Deputy Commander

Geoffrey Keen
as Chief Superintendent Jim Malcolm

Sydney Tafler
as Stone

Peter Burton
as Creasey

George Rose
as Slob

Arthur Rigby
as Detective Inspector at Chester

Ralph Truman
as Colonel Blenkinsop

Ian Bannen
as The Young Workman - Stanley James

Maureen Davis
as The Young Workman's Wife - Mrs. James

John Warwick
as Detective Inspector at Shipping Office

Joss Ambler
as Cashier at Shipping Office

Barry Keegan
as Detective Constable in Hospital Ward

Alec McCowen
as House Surgeon

Harry Locke
as Secondhand Dealer

Nicholas Parsons
as Police Constable Bates

Warwick Ashton
as Newspaper Circulation Manager

Ursula Howells
as Mrs. Elliot / Mrs. Gilson

David Davies
as Welsh Police Constable

Julie Milton
as Welsh Newsagent's Daughter

Meredith Edwards
as Mr. Thomas

Harold Goodwin
as Official at Somerset House

John Welsh
as House Agent at Shepperton

Gillian Webb
as Housewife at Shepperton

Maureen Delaney
as Mrs. Stevens, the daily help

Jameson Clark
as Detective Superintendent Ogilvie

William Mervyn
as Manager of Festival Hall

Vincent Ball
as P.C. at Hospital (uncredited)

Richard Davies
as Detective (uncredited)

Frazer Hines
as Urchin (uncredited)

Stratford Johns
as Constable (uncredited)

David Lodge
as Detective at Car Lot (uncredited)

Guy Standeven
as Detective (uncredited)

Frederick Treves
as Detective tailing Creasey (uncredited)

Peter Welch
as CID Man (uncredited)

Martin Wyldeck
as Officer in Criminal Records Department (uncredited)

Dennis Carnell
as

Edward Cast
as

Michael Collins
as

Fred Davis
as

Jack Dearlove
as

Robert Gregory
as

Fred Griffiths
as

Patrick Halpin
as

Aidan Harrington
as

George Holdcroft
as

Lindsay Hooper
as

Arthur Howell
as

Colin McKenzie
as

Jack McNaughton
as

Robert Moor
as

Fred Nicholas
as

John Paul
as

Roy Purcell
as

Charles Rayford
as

Anthony Richmond
as

Pat Ryan
as

Philip Stewart
as

Meadows White
as

John Wilder
as Detective (uncredited)

Sonnie Wills
as
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