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John Mills as Dr. Howard Latimer |
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Derek Farr as Kenneth Palmer |
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Noelle Middleton as Laura James |
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Wilfrid Hyde-White as Maj. Harrington aka Robert Brady |
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Roland Culver as Detective Inspector Dane |
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Mervyn Johns as Dr. George Kimber |
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Rène Ray as Mrs. Ambler |
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Lionel Jeffries as Geoffrey Windsor |
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Lisa Daniely as Frieda Veldon |
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David Williams as The Detective Sergeant |
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Diana Lambert as Latimer's Office Nurse |
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Hal Osmond as Joe - Golf Caddy |
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Gillian Moran as |
| Directing | Gerald Thomas | Director |
| Writing | Francis Durbridge | Screenplay |
| Art | Jack Stevens | Art Direction |
| Production | Basil Keys | Production Manager |
| Camera | Otto Heller | Director of Photography |
| Camera | Alan Hume | Camera Operator |
| Directing | William Hill | Assistant Director |
| Sound | Len Page | Sound Recordist |
| Sound | Richard Marden | Sound Editor |
| Directing | Rita Davison | Continuity |
| Costume & Make-Up | Jill Carpenter | Makeup Artist |
| Costume & Make-Up | Marjorie Whittle | Hairdresser |
| Costume & Make-Up | Vi Murray | Wardrobe Designer |
| Sound | Stanley Black | Original Music Composer |
| Editing | Peter Boita | Editor |
| Art | Eric Saw | Draughtsman |
| Production | Peter Rogers | Producer |
