Ellery Queen, Master Detective

Ellery Queen

Nikki Porter

Insp. Queen

Sgt. Velle

Dr. James Rogers

Barbara Braun

John Braun

Dr. Prouty

Lydia Braun

Cornelia

Rocky Taylor

Zachary

Amos

Valerie Norris

Doctor's Assistant (uncredited)

Desk Sergeant (uncredited)

Elevator Guard (uncredited)

Ambulance Driver (uncredited)

Flynn (uncredited)

Rogers' Assistant (uncredited)

Elevator Passenger (uncredited) (unconfirmed)