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