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Richard Todd as Edward Mercer |
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Eva Bartok as Adriana Medova |
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John Gregson as Renzo Uccello |
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George Coulouris as Chief of Police Spadoni |
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Margot Grahame as Rosa Melitus |
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Walter Rilla as Count Boria |
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John Bailey as Lieutenant Longo |
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Sidney James as Bernardo |
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Martin Boddey as Gufo |
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Michael Balfour as Moretto |
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Sydney Tafler as Boldesca |
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Miles Malleson as Grespi |
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Eric Pohlmann as Gostini |
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David Hurst as Minelli |
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Raymond Young as Luigi |
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Ferdy Mayne as Tio |
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Jill Clifford as Renata |
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Eileen Way as Woman Detective |
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Toni Lucarda as Nerva |
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Janice Kane as Ninetta |
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Meier Tzelniker as Mayor of Mirave |
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Betty E. Box as Woman Next to the Factory Tour Guide (Uncredited) |
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Victor Harrington as Bystander (Uncredited) |
| Directing | Ralph Thomas | Director |
| Writing | Victor Canning | Novel |
| Writing | Victor Canning | Screenplay |
| Production | Betty E. Box | Producer |
| Production | Earl St. John | Executive Producer |
| Crew | Ernest Steward | Cinematography |
| Editing | Gerald Thomas | Editor |
| Art | George Provis | Art Direction |
| Costume & Make-Up | Yvonne Caffin | Costume Design |
| Directing | Jack N. Green | Third Assistant Director |
| Costume & Make-Up | Ernest Gasser | Makeup Artist |
| Costume & Make-Up | Stella Rivers | Hairstylist |
| Production | Douglas Peirce | Production Manager |
| Directing | Peter Bolton | Assistant Director |
| Sound | John Dennis | Sound Recordist |
| Sound | Gordon K. McCallum | Sound Mixer |
| Sound | Peter Seabourne | Sound Editor |
| Camera | H. A. R. Thomson | Camera Operator |
| Camera | Cornel Lucas | Still Photographer |
| Costume & Make-Up | Yvonne Caffin | Costume Supervisor |
| Sound | Muir Mathieson | Conductor |
| Directing | Tilly Day | Continuity |
| Crew | Arthur Alcott | Production Controller |
| Sound | Nino Rota | Original Music Composer |
| Camera | Ernest Steward | Director of Photography |
| Directing | Jim Ware | Second Assistant Director |
| Art | Robert Cartwright | Draughtsman |
| Art | Roy Dorman | Draughtsman |
| Art | John Gow | Draughtsman |
| Art | Iris Newell | Assistant Art Director |
| Art | Roy Walker | Draughtsman |
| Sound | Charles Squires | Assistant Sound Editor |
| Camera | John Alcott | Clapper Loader |
| Camera | Reginald H. Morris | Focus Puller |
| Editing | Peter Boita | First Assistant Editor |
| Production | Maurizio Lodi-Fè | Location Manager |
| Production | Fanya Fisher | Production Secretary |
