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Sydney Seaward as Inspector Dunbar |
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Arthur M. Cullin as Dr. Cumberley |
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Harvey Braban as Gaston Max |
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Annie Esmond as Denise Ryland |
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Norman Page as Soames |
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Kitty Fielder as Lady of the Poppies |
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Kiyoshi Takase as Ho-Pin |
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A.C. Fotheringham-Lysons as Henry Leroux |
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Mary Massart as Helen Cumberley |
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Cyril Percival as John Howard Edel |
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Ivy King as Mrs. Leroux |
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June Tripp as Mrs. Vernon |
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Eric Albury as Gianopolis |
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Geoffrey Benstead as Sowerby |
| Directing | René Plaissetty | Director |
| Crew | Jack E. Cox | Cinematography |
| Writing | Gerard Fort Buckle | Writer |
| Writing | Sax Rohmer | Writer |
| Production | Oswald Stoll | Producer |
