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Ralph Bellamy as Ellery Queen |
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Margaret Lindsay as Nikki Porter |
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Charley Grapewin as Insp. Queen |
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Noel Madison as Gordon Cobb |
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Ann Doran as Sheila Cobb |
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James Burke as Sgt. Velie |
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Anna May Wong as Lois Ling |
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Eduardo Ciannelli as Count Brett (as Edward Ciannelli) |
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Frank Albertson as Sanders |
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Charles Lane as Doc Prouty |
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Russell Hicks as Harry Walsh |
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Tom Dugan as McGrath |
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Mantan Moreland as Roy |
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Theodore von Eltz as Jim Ritter |
| Directing | James P. Hogan | Director |
| Camera | James S. Brown Jr. | Director of Photography |
| Writing | Frederic Dannay | Writer |
| Writing | Eric Taylor | Screenplay |
| Writing | Manfred Lee | Writer |
| Editing | Dwight Caldwell | Editor |
| Sound | Lee Zahler | Original Music Composer |
| Production | Larry Darmour | Producer |
