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May Whitty as Mrs O'Neill aka Madame Rosalie la Grange |
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Madge Evans as Helen "Nell" O'Neill |
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Lewis Stone as Inspector Marney |
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Elissa Landi as Helen Trent |
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Thomas Beck as Dick Crosby |
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Henry Daniell as John Wales |
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Janet Beecher as Lady Alicia Crosby |
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Ralph Forbes as Major Lionel Trent |
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Holmes Herbert as Governor Sir Roscoe Crosby |
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Heather Thatcher as Mary Eastwood |
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Charles Trowbridge as Dr Mason |
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Robert Coote as Stanby |
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Elsa Buchanan as Grace Stanby |
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Lal Chand Mehra as Professor Feringeea |
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Neil Fitzgerald as Constable |
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Louis Vincenot as Chotee |
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Matthew Boulton as Grimshaw (uncredited) |
| Directing | George B. Seitz | Director |
| Writing | Marion Parsonnet | Screenplay |
| Writing | Bayard Veiller | Theatre Play |
| Camera | Charles G. Clarke | Director of Photography |
| Editing | W. Donn Hayes | Editor |
| Sound | Douglas Shearer | Sound Director |
