Ralph Bellamy
Ellery Queen
Acting
Margaret Lindsay
Nikki Porter
Acting
Charley Grapewin
Insp. Queen
Acting
Mona Barrie
Nurse Marian Tracy
Acting
Paul Hurst
Page
Acting
James Burke
Sgt. Velie
Acting
Leon Ames
John Stack
Acting
George Zucco
Dr. Edwin L. Jannery
Acting
Blanche Yurka
Mrs. Augusta Stack
Acting
Charlotte Wynters
Miss Fox
Acting
Tom Dugan
Lou Thomas
Acting
Olin Howland
Dr. Williams
Acting
Dennis Moore
Dr. Dunn
Acting
Jean Fenwick
Alice Stack
Acting
Pierre Watkin
Crothers
Acting
Byron Foulger
Hospital Orderly (uncredited)
Acting