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)