Diễn viên
Jack McNaughton
Jack Hawkins
Supt Tom Halliday
Harry Locke
Secondhand Dealer
Guy Standeven
Detective (uncredited)
Harold Goodwin
Official at Somerset House
Meadows White
Joss Ambler
Cashier at Shipping Office
Meredith Edwards
Mr. Thomas
Sydney Tafler
Stone
Arthur Rigby
Detective Inspector at Chester
Fred Davis
George Rose
Slob
Nicholas Parsons
Police Constable Bates
Jameson Clark
Detective Superintendent Ogilvie
David Davies
Welsh Police Constable
John Stratton
Sergeant Ward
Richard Leech
Nightwatchman / Gilson
Peter Burton
Creasey
Ian Bannen
The Young Workman - Stanley James
John Welsh
House Agent at Shepperton
Frazer Hines
Urchin (uncredited)
David Lodge
Detective at Car Lot (uncredited)
Geoffrey Keen
Chief Superintendent Jim Malcolm
Richard Davies
Detective (uncredited)
Fred Griffiths
George Holdcroft
Ralph Truman
Colonel Blenkinsop
Alec McCowen
House Surgeon
Robert Moor
John Paul
Dorothy Alison
Mary Halliday
Frederick Treves
Detective tailing Creasey (uncredited)
Martin Wyldeck
Officer in Criminal Records Department (uncredited)
Roy Purcell
Sam Kydd
Police Constable in Information Room
Maureen Davis
The Young Workman's Wife - Mrs. James
Stratford Johns
Constable (uncredited)
Pat Ryan
Barry Keegan
Detective Constable in Hospital Ward
Peter Welch
CID Man (uncredited)
Maureen Delaney
Mrs. Stevens, the daily help
Vincent Ball
P.C. at Hospital (uncredited)
Glyn Houston
Detective Sergeant in 'Q' car
William Mervyn
Manager of Festival Hall