- Ralph Bellamy
- Ellery Queen
- Margaret Lindsay
- Nikki Porter
- Charley Grapewin
- Inspector Richard Queen
- Anna May Wong
- Lois Ling
- James Burke
- Police Sergeant Velie
- Eduardo Ciannelli
- Count Brett
- Frank Albertson
- Sanders
- Ann Doran
- Sheila Cobb
- Noel Madison
- Gordon Cobb
- Charles Lane
- Doc Prouty
- Russell Hicks
- Walsh
- Tom Dugan
- McGrath
- Mantan Moreland
- Roy
- Theodore von Eltz
- Jim Ritter
- Jimmy Aubrey
- Expressman
- Edward Earle
- Hotel Manager
- George McKay
- Morgue Wagon Attendant
- Honorable Wu
- Cobb's Servant
- Jack Cheatham
- Jack, Desk Sergeant
- Chester Gan
- Henchman
- Chuck Hamilton
- Expressman
- Eddie Kane
- Poker player
- Richard Loo
- Henchman
- Lee Phelps
- Police Sergeant
