Cast
Ralph Bellamy
Ellery Queen
Charley Grapewin
Insp. Queen
Marsha Hunt
Barbara Braun
Marion Martin
Cornelia
Lee Phelps
Flynn (uncredited)
Alan Ladd
Elevator Passenger (uncredited) (unconfirmed)
Margaret Lindsay
Nikki Porter
Michael Whalen
Dr. James Rogers
Douglas Fowley
Rocky Taylor
Byron Foulger
Amos
Katherine DeMille
Valerie Norris
James Burke
Sgt. Velle
Fred Niblo
John Braun
Charles Lane
Dr. Prouty
Ann Shoemaker
Lydia Braun
Frank O'Connor
Ambulance Driver (uncredited)
Jack Rice
Rogers' Assistant (uncredited)
Morgan Wallace
Zachary
Jack Cheatham
Desk Sergeant (uncredited)