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Patrick Barr as Det. Insp. Alan Wembury |
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Alexander Knox as Dr Anthony Lomond |
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Wilfrid Lawson as Maurice Meister |
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Sonnie Hale as Samuel Cuthbert 'Sam' Hackett |
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Louise Henry as Cora Ann Milton |
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John Longden as Inspector Bliss |
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Patricia Roc as Mary Lenley |
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Peter Croft as John Lenley |
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Arthur Hambling as Det. Sgt. Richards |
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George Merritt as Police Station Sergeant |
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John Turnbull as Prison Governor |
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Charles Eaton as Col. Walford |
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Cameron Hall as Drunken Scotsman (uncredited) |
| Directing | Walter Forde | Director |
| Writing | Edgar Wallace | Novel |
| Writing | Sidney Gilliat | Screenplay |
| Crew | Ronald Neame | Cinematography |
| Sound | Ernest Irving | Original Music Composer |
| Editing | Charles Saunders | Editor |
