Cast

William Gargan

Ellery Queen

Margaret Lindsay

Nikki Porter

Charley Grapewin

Inspector Richard Queen

Gale Sondergaard

Mrs. Van Dorn

Gilbert Roland

Paul Gilette

Sig Ruman

Heinrich, Spy Leader

James Burke

Police Sergeant Velie

Crew

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Frederic Dannay

Story (Writing)

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Eric Taylor

Screenplay (Writing)

James P. Hogan

Director (Directing)

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Manfred Lee

Story (Writing)

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Arthur Strawn

Additional Dialogue (Crew)