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Jack Hawkins
Supt Tom Halliday
John Stratton
Sergeant Ward
Dorothy Alison
Mary Halliday
Michael Brooke
Tony Halliday
Sam Kydd
Police Constable in Information Room
Glyn Houston
Detective Sergeant in 'Q' car
Richard Leech
Nightwatchman / Gilson
Newton Blick
Deputy Commander
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
Maureen Davis
The Young Workman's Wife - Mrs. James
John Warwick
Detective Inspector at Shipping Office
Joss Ambler
Cashier at Shipping Office
Barry Keegan
Detective Constable in Hospital Ward
Alec McCowen
House Surgeon
Harry Locke
Secondhand Dealer
Nicholas Parsons
Police Constable Bates
Warwick Ashton
Newspaper Circulation Manager
Ursula Howells
Mrs. Elliot / Mrs. Gilson
David Davies
Welsh Police Constable
Julie Milton
Welsh Newsagent's Daughter
Meredith Edwards
Mr. Thomas
Harold Goodwin
Official at Somerset House
John Welsh
House Agent at Shepperton
Gillian Webb
Housewife at Shepperton
Maureen Delaney
Mrs. Stevens, the daily help
Jameson Clark
Detective Superintendent Ogilvie
William Mervyn
Manager of Festival Hall
Vincent Ball
P.C. at Hospital (uncredited)
Richard Davies
Detective (uncredited)
Frazer Hines
Urchin (uncredited)
Stratford Johns
Constable (uncredited)
David Lodge
Detective at Car Lot (uncredited)
Guy Standeven
Detective (uncredited)
Frederick Treves
Detective tailing Creasey (uncredited)
Peter Welch
CID Man (uncredited)
Martin Wyldeck
Officer in Criminal Records Department (uncredited)
Dennis Carnell
Edward Cast
Michael Collins
Fred Davis
Jack Dearlove
Robert Gregory
Fred Griffiths
Patrick Halpin
Aidan Harrington
George Holdcroft
Lindsay Hooper
Arthur Howell
Colin McKenzie
Jack McNaughton
Robert Moor
Fred Nicholas
John Paul
Roy Purcell
Charles Rayford
Anthony Richmond
Pat Ryan
Philip Stewart
Meadows White
John Wilder
Sonnie Wills
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