Directed by
| Norman Lee | ||
Writing Credits
| Herman C. McNeile | ... | (novel) (as Sapper) |
| Patrick Kirwan | ... | (screenplay) |
| James Parrish | ... | (screenplay) |
Cast (in credits order)
| John Lodge | ... | Hugh Drummond | |
| Dorothy Mackaill | ... | Doris Thompson | |
| Victor Jory | ... | Gregoroff | |
| Claud Allister | ... | Algy Longworth | |
 |
Richard Bird | ... | Caldwell |
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Hugh Miller | ... | Ivan Kalinsky |
| Leslie Perrins | ... | Maj. Grayson | |
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Brian Buchel | ... | Meredith |
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Jim Gérald | ... | Veight (as Jim Gerald) |
| Maire O'Neill | ... | Norah, the Housekeeper | |
| Annie Esmond | ... | Mrs. Caldwell | |
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Frank Cochrane | ... | Dr. Belfrus |
| William Dewhurst | ... | Reginald Portside | |
| Rest of cast listed alphabetically: | |||
| Wilfrid Hyde-White | ... | Conrad (uncredited) | |
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Ben Williams | ... | Reporter (uncredited) |
Cinematography by
| Walter J. Harvey | ... | (as Walter Harvey) (photography) |
Editing by
| J. Corbett | ||
Second Unit Director or Assistant Director
| Richard Mishiku | ... | assistant director (as R. Mishiku) |
Art Department
| John Mead | ... | settings (as John F. Mead) |
Sound Department
| Buster Ambler | ... | sound recordist (as A.G. Ambler) |
Additional Crew
| Walter C. Mycroft | ... | director of production |
