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