"A police detective suspects that his sister's boyfriend is a murderer."
Dennis Price
as Inspector Peter Lawton
Peggy Evans
as Joan Lawton
Rex Garner
as Sgt. Bill Todd
Philip Saville
as Edward "Teddy" King / Jim King
Greta Mayaro
as Lena
Arnold Bell
as McMann
Leonard Sharp
as Old Skip
Nora Gordon
as Nanna
Renee Goddard
as Lady Branstead
Arthur Lovegrove
as Inspector Cobb
Daphne Maddox
as Victim
Robert Weeden
as Constable
Eddie Boyce
as Police Constable (uncredited)
John Davis
as Transmitting Constable (uncredited)
Victor Harrington
as Jewel Box Nightclub Patron (uncredited)
Aileen Lewis
John Ainsworth
Screenplay
Moie Charles
Additional Dialogue
Francis Searle
Director
Philip Leakey
Makeup Artist
Ken Nicholson
Focus Puller
David Henley
Producer
Kathleen Moore
Wardrobe Assistant
Derick McColm
Sound
Terry Laurie
Assistant Editor
Eric Spear
Original Music Composer
S.D. Onions
Director of Photography
Adam Dawson
Editor
John Oldknow
Assistant Director
George Paterson
Art Direction
Anthony Busbridge
Clapper Loader
Douglas Hickox
Second Assistant Director
John 'Pinky' Green
Production Manager
William Germain
Don Wortham
Boom Operator
Conductor
Gladys Reeve
Continuity
Bill Oxley
Camera Operator
