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Patric Curwen as Dr. Lomond |
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Esmond Knight as John Lenley |
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John Longden as Inspector Wembury |
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Carol Goodner as Cora Ann Milton |
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Gordon Harker as Samuel Hackett |
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Franklin Dyall as Maurice Meister |
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Dorothy Bartlam as Mary Lenley |
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Henry Hallatt as Inspector Bliss |
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Arthur Stratton as Sgt. Carter |
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Kathleen Joyce as Gwenda Milton |
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Eric Stanley as Commissioner |
| Writing | Angus MacPhail | Writer |
| Production | Bryan Edgar Wallace | Production Manager |
| Directing | Walter Forde | Director |
| Crew | Sidney Gilliat | Additional Dialogue |
| Sound | Harold V. King | Sound |
| Writing | Edgar Wallace | Novel |
| Camera | Leslie Rowson | Director of Photography |
| Directing | Rosaire Rutland | Continuity |
| Camera | Alex Bryce | Director of Photography |
| Editing | Ian Dalrymple | Editor |
| Art | Norman G. Arnold | Set Designer |
| Writing | Robert Stevenson | Writer |
| Production | Michael Balcon | Producer |
