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