Philip Trent
Michael Wilding
Margaret Manderson
Margaret Lockwood
Concert Attendee
Ernest Blyth
Police Constable
Robert Cawdron
Tim O'Reilly
John Chandos
Conductor
Anthony Collins
Coroner
Henry Edwards
Pianist
Eileen Joyce
Jimmy - Reporter
Ben Williams
Sigsbee Manderson
Orson Welles
John Marlowe
John McCallum
Burton Cupples
Miles Malleson
Calvin C. Bunner
Hugh McDermott
Martin
Jack McNaughton
Inspector Murch
Sam Kydd
Horace Evans
Kenneth Williams
Reporter in Court
Geoffrey Bayldon
Novel
E.C. Bentley
Director
Herbert Wilcox
Producer
Screenplay
Pamela Bower
Editor
Bill Lewthwaite
Art Direction
William C. Andrews
Set Decoration
Len Townsend
Director of Photography
Mutz Greenbaum
Original Music Composer
Clapper Loader
Wally Fairweather
Alan Hall
Hairstylist
Nora Bentley
Makeup Supervisor
Harold Fletcher
Helen Penfold
Production Manager
John Wilcox
Assistant Director
Frank Hollands
Costume Supervisor
Maude Churchill