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Margaret Lockwood as Frances Gray |
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Dane Clark as Bill Casey |
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Marius Goring as Commandant Anton Razinski |
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Naunton Wayne as Mr. Hedgerley |
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Wilfrid Hyde-White as Mr. Luke |
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Eugene Deckers as Alf |
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Olaf Pooley as Detective-Interrogator |
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Gladys Henson as Attendant |
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Paul Hardtmuth as Priest |
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Michael Hordern as Lab Director Owens |
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George Benson as Sandwich Stand Customer |
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Eric Pohlmann as Joe - the bartender |
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John Horsley as Customs Officer |
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Patric Doonan as Customs Man |
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Joan Haythorne as Judy |
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Jill Balcon as Wardress (uncredited) |
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John Gabriel as Night Field Telephone Officer (uncredited) |
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Hyma Beckley as Café Mimosa Patron (uncredited) |
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John Boxer as Police Sergeant at Customs Café (uncredited) |
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Ernest Butcher as Tom - Lab Assistant (uncredited) |
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Daniel Brown as Train Passenger (uncredited) |
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Robert Cawdron as Soldier at Station Checkpoint (uncredited) |
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Noel Johnson as Frank Conway (uncredited) |
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Anton Diffring as Officer at Station (uncredited) |
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Toni Frost as Stewardess (uncredited) |
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Charles Hammon as Train Passenger in Platform Line-up (uncredited) |
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Philo Hauser as Waiter (uncredited) |
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John G. Heller as Soldier at Station Check Point (uncredited) |
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Sam Kydd as Customs Man (uncredited) |
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Richard Marner as Soldier on Train (uncredited) |
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Louis Matto as Café Mimosa Waiter (uncredited) |
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Anthony Newley as Operator (uncredited) |
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Michael Ritterman as The ‘Tail’ (uncredited) |
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Lance Secretan as Alan (uncredited) |
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Dinah Sheridan as Train Passenger at Checkpoint (uncredited) |
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Ewen Solon as Enemy Scientist (uncredited) |
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Emile Stemmler as Soldier at Station Checkpoint (uncredited) |
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Robert Vossler as Day Sentry at First Checkpoint (uncredited) |
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John Wilder as Customs Officer (uncredited) |
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Billy Wilmot as Café Mimosa Customer (uncredited) |
| Directing | Roy Ward Baker | Director |
| Writing | Eric Ambler | Writer |
| Production | Antony Darnborough | Producer |
| Production | Earl St. John | Executive Producer |
| Sound | Richard Addinsell | Original Music Composer |
| Camera | Reginald H. Wyer | Director of Photography |
| Editing | Alfred Roome | Editor |
