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Alex Nicol as Mark Kendrick |
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Hillary Brooke as Carol Forrest |
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Sidney James as Beverly Forrest (as Sidney James) |
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Susan Stephen as Andrea Forrest |
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Paul Carpenter as Vincent Gordon |
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Alan Wheatley as Inspector MacLennan |
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Peter Illing as Harry Stevens |
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Gordon McLeod as Doctor Emery |
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Joan Hickson as Mrs. Hardcastle |
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John Sharp as Mr. Hardcastle |
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Hugh Dempster as Frank |
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Monti DeLyle as Head Waiter |
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Howard Lang as Inspector Edgar (uncredited) |
| Writing | Ken Hughes | Screenplay |
| Directing | Ken Hughes | Director |
| Production | Anthony Hinds | Producer |
| Sound | Ivor Slaney | Original Music Composer |
| Editing | James Needs | Editor |
| Writing | Ken Hughes | Novel |
| Camera | Walter J. Harvey | Director of Photography |
| Camera | Len Harris | Camera Operator |
| Crew | Robert L. Lippert | Presenter |
| Production | John 'Pinky' Green | Production Manager |
| Directing | Renée Glynne | Continuity |
| Directing | Jimmy Sangster | Assistant Director |
| Sound | Bill Salter | Sound Recordist |
| Art | J. Elder Wills | Art Direction |
| Costume & Make-Up | Phil Leaky | Makeup Artist |
| Costume & Make-Up | Nina Broe | Hairdresser |
