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Valerie Hobson as Alycia Roche |
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James Robertson Justice as Jonathan Roche |
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Edward Underdown as Hugh Allen |
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Henry Kendall as Ronald Parker |
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Garry Marsh as Inspector Thornton |
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Sam Kydd as Sgt. Baker |
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Ian Fleming as Dr. Forrest |
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Daniel Wherry as Pierce |
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Daphne Newton as Miss Quinn |
| Writing | Gerald Landeau | Writer |
| Sound | Frank Cordell | Music |
| Writing | John Gilling | Writer |
| Production | Monty Berman | Producer |
| Production | Robert S. Baker | Producer |
| Directing | John Gilling | Director |
| Camera | Desmond Davis | Focus Puller |
| Camera | Monty Berman | Director of Photography |
