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Herbert Lom as Maurice Meister |
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Donald Wolfit as Dr. Lomond |
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Mai Zetterling as Lisa |
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Greta Gynt as Cora Ann Milton |
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William Hartnell as Sam Hackett |
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Norman Wooland as Inspector Bliss |
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Denholm Elliott as John Lemley |
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Dora Bryan as Mrs. Hackett |
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Charles Victor as Inspector Wembury |
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Walter Fitzgerald as Commissioner |
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John Stuart as Gardener |
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John Slater as Bell |
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Edward Chapman as Stranger |
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Campbell Singer as Station Sergeant Carter |
| Directing | Guy Hamilton | Director |
| Writing | Edgar Wallace | Theatre Play |
| Writing | Lesley Storm | Screenplay |
| Writing | Val Valentine | Screenplay |
| Production | Hugh Perceval | Producer |
| Editing | Bert Bates | Editor |
| Art | William Hutchinson | Production Design |
| Costume & Make-Up | Joseph Bato | Costume Design |
| Camera | Edward Scaife | Director of Photography |
| Sound | Malcolm Arnold | Original Music Composer |
| Sound | Ken Ritchie | Boom Operator |
| Costume & Make-Up | Eileen Bates | Hairdresser |
| Camera | Robert Day | Camera Operator |
| Camera | Gerry Fisher | Assistant Camera |
| Sound | Muir Mathieson | Music Director |
