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Crauford Kent as Inspector Angus Blake |
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Florence Allen as Lady Diana Blanton |
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Albert Prisco as Prince Darius (as Albert Priscoe) |
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Monte Montague as Jarvis |
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Grace Cunard as Mary Duveen- aka Queen of Diamonds |
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Herbert Prior as Lord Blanton |
| Production | Henry MacRae | Producer |
| Editing | Alvin Todd | Editor |
| Writing | Harold M. Atkinson | Scenario Writer |
| Writing | Harold M. Atkinson | Story |
| Directing | Ray Taylor | Director |
| Camera | John Hickson | Director of Photography |
