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Louis Jourdan as Duke Philippe de Beauvais |
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Belinda Lee as Virginia Traill |
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Keith Michell as Colonel St. Gerard |
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Richard O'Sullivan as Louis XVII / Richard de Beauvais |
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Martita Hunt as Lady Lydia Fell |
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Finlay Currie as Mr. Patient |
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Anne Heywood as Glynis |
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Brian Rawlinson as Dylan Evans |
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Terence Longdon as Sir Frederick Venner |
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Frederick Leister as Capt. Andrew Ogden |
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Austin Trevor as Mr. Petitval |
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Laurence Payne as Lautrec |
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Jacques Brunius as De Chassagne |
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John Dearth as Simon the Jailer |
| Directing | Brian Desmond Hurst | Director |
| Writing | Vaughan Wilkins | Novel |
| Writing | Robin Estridge | Screenplay |
| Camera | Mike Fox | Clapper Loader |
