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Robert Newton as Dr. Clive Riordan |
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Phil Brown as Bill Kronin |
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Sally Gray as Storm Riordan |
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Naunton Wayne as Supt. Finsbury |
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James Harcourt as Aitkin (butler) |
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Betty Cooper as Miss Stevens (receptionist) |
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Allan Jeayes as The Colonel, blustery club member |
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Ronald Adam as Talkative, balding club member |
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Roddy Hughes as Bespectacled third club member, from Whitehall |
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Olga Lindo as Mrs. Humphries |
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Stanley Baker as Policeman at Garage |
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Russell Waters as Detective at Garage |
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Michael Balfour as American Sailor Promoting Book |
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Sam Kydd as Club steward |
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Ernest Clark as |
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Lyonel Watts as Club Member |
| Directing | Edward Dmytryk | Director |
| Writing | Alec Coppel | Novel |
| Writing | Alec Coppel | Screenplay |
| Production | Nat A. Bronstein | Producer |
| Sound | Nino Rota | Original Music Composer |
| Camera | C.M. Pennington-Richards | Director of Photography |
| Editing | Lito Carruthers | Editor |
| Art | Duncan Sutherland | Art Direction |
| Costume & Make-Up | Betty Baugh | Hairstylist |
| Costume & Make-Up | Stuart Freeborn | Makeup Artist |
| Production | Kenneth Horne | Production Manager |
| Directing | George Mills | Assistant Director |
| Production | Kenneth Horne | Associate Producer |
| Art | Ken Adam | Assistant Art Director |
| Sound | Jack Locke | Sound Recordist |
| Sound | Gordon K. McCallum | Sound Recordist |
| Sound | Winston Ryder | Sound Editor |
| Camera | Robert Day | Camera Operator |
| Sound | Louis Levy | Conductor |
| Directing | Barbara Cole | Continuity |
| Writing | Alec Coppel | Dialogue |
| Crew | Phil Brown | Dialogue Coach |
