Directed by
| James P. Hogan | ... | (as James Hogan) |
Writing Credits
| Eric Taylor | ... | (screenplay) |
| Frederic Dannay | ... | (as Ellery Queen) and |
| Manfred Lee | ... | (as Ellery Queen) |
Cast (in credits order)
| 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 (as Edward Ciannelli) | |
| 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 | |
| Rest of cast listed alphabetically: | |||
| Jimmy Aubrey | ... | Expressman | |
| Edward Earle | ... | Hotel Manager | |
 |
George McKay | ... | Morgue Wagon Attendant |
| Honorable Wu | ... | Cobb's Servant | |
| Jack Cheatham | ... | Jack, Desk Sergeant (uncredited) | |
| Chester Gan | ... | Henchman (uncredited) | |
| Chuck Hamilton | ... | Expressman (uncredited) | |
| Eddie Kane | ... | Poker player (uncredited) | |
| Richard Loo | ... | Henchman (uncredited) | |
|
|
Lee Phelps | ... | Police Sergeant (uncredited) |
Produced by
| Larry Darmour | ... | producer |
Music by
| Lee Zahler | ||
Cinematography by
| James S. Brown Jr. | ... | director of photography |
Editing by
| Dwight Caldwell | ||
Stunts
| Eddie Parker | ... | stunts (uncredited) |
Costume and Wardrobe Department
| Eugene Joseff | ... | costume jeweller (uncredited) |
