Cast
- Jack Holt as Jack Hart aka Quinn
- Constance Cummings as Julie Arnold
- Boris Karloff as Jim Henderson
- Claude King as Arnold
- Bertha Mann as Nurse Edwards
- Edward Van Sloan as Dr. August Steiner
- Edward Van Sloan as Dr. Alec Munsell
- Edward Van Sloan as Mr. X
- Willard Robertson as Capt. E.J. Hawkes
- Thomas E. Jackson as Agent Burke
- Jessie Arnold as Eastland Hospital Nurse
- Clarence Burton as Agent Gorman
Crew
- John Francis Dillon · Director
- Jo Swerling · Writer
- Ted Tetzlaff · Cinematographer
- Otis Garrett · Editor