Besetzung 21

1. 

   Ralph Bellamy

   Ellery Queen

2. 

   Margaret Lindsay

   Nikki Porter

3. 

   Charley Grapewin

   Insp. Queen

4. 

   James Burke

   Sgt. Velle

5. 

   Michael Whalen

   Dr. James Rogers

6. 

   Marsha Hunt

   Barbara Braun

7. 

   Fred Niblo

   John Braun

8. 

   Charles Lane

   Dr. Prouty

9. 

   Ann Shoemaker

   Lydia Braun

10. 

    Marion Martin

    Cornelia

11. 

    Douglas Fowley

    Rocky Taylor

12. 

    Morgan Wallace

    Zachary

13. 

    Byron Foulger

    Amos

14. 

    Katherine DeMille

    Valerie Norris

15. Peter Bronte

    Doctor's Assistant (uncredited)

16. 

    Jack Cheatham

    Desk Sergeant (uncredited)

17. Arthur Millett

    Elevator Guard (uncredited)

18. 

    Frank O'Connor

    Ambulance Driver (uncredited)

19. 

    Lee Phelps

    Flynn (uncredited)

20. 

    Jack Rice

    Rogers' Assistant (uncredited)

21. 

    Alan Ladd

    Elevator Passenger (uncredited) (unconfirmed)

Crew 5