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Ralph Bellamy
Ellery Queen
Margaret Lindsay
Nikki Porter
Charley Grapewin
Insp. Queen
James Burke
Sgt. Velle
Michael Whalen
Dr. James Rogers
Marsha Hunt
Barbara Braun
Fred Niblo
John Braun
Charles Lane
Dr. Prouty
Ann Shoemaker
Lydia Braun
Marion Martin
Cornelia
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Released
Columbia Pictures
Larry Darmour Productions
Kurt Neumann
Director
Manfred Lee
Story
Frederic Dannay
Eric Taylor
Screenplay
