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