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Ray Barrett as Henry Fraser |
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Katharine Blake as Claudia |
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Nigel Stock as George Matthews |
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William Hartnell as Insp. Roberts |
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Patricia Bredin as Lucy |
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Richard Clarke as Charles Wagner |
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Noel Trevarthen as Blake |
| Directing | Herbert Wise | Director |
| Writing | Jimmy Sangster | Screenplay |
| Writing | Edgar Wallace | Novel |
| Production | Jack Greenwood | Producer |
| Sound | Bernard Ebbinghouse | Music |
| Camera | James Wilson | Director of Photography |
| Editing | Derek Holding | Editor |
| Production | Ronnie Curtis | Casting Director |
| Art | Peter Mullins | Art Direction |
| Costume & Make-Up | Gladys Leakey | Hairdresser |
| Costume & Make-Up | Stella Morris | Makeup Artist |
| Production | Ron Fry | Production Manager |
| Directing | Ted Lewis | Assistant Director |
| Sound | Brian Blamey | Sound Editor |
| Sound | Sidney Rider | Sound Recordist |
| Sound | Eric Stockl | Sound Recordist |
| Camera | Peter Allwork | Camera Operator |
