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