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
Arthur Strawn
Additional Dialogue
James P. Hogan
Director
Eric Taylor
Screenplay
Frederic Dannay
Story
Manfred Lee
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