Allan Davis (Director) · Philip Mackie (Screenplay)
Bernard Lee
Superintendent Meredith
David Knight
Lexman
Francis de Wolff
Ramon Karadis
Colette Wilde
Grace
Christine Shaw
Linda Buckland
Stanley Morgan
Sergeant Anson
Richard Caldicot
Fisher
Edmond Bennett
Manservant
Simon Lack
Jock
Anthony Baird
Sergeant Butterfield
Gladys Henson
Landlady
Alfred Maron
Finch
Richard Vernon
Viney
Harry Locke
Amis
Roy Purcell
Brennan
Kenneth Fortescue
Secretary (C.I.D.)
A. J. Brown
Commissioner of Police
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A man is murdered in a room with no windows and a steel lined door which locks only from the inside.
