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