Detective Philo Vance is in charge of the investigation of several mysterious murders. Things take a turn when he gathers evidence against Major Fenwicke-Ralston.
| Writing | S.S. Van Dine | Novel |
| Directing | Edwin L. Marin | Director |
| Writing | Bertram Millhauser | Screenplay |
| Editing | Ben Lewis | Editor |
| Production | Lucien Hubbard | Producer |
| Production | Ned Marin | Producer |
| Camera | Charles G. Clarke | Director of Photography |
| Sound | William Axt | Original Music Composer |
| Art | Cedric Gibbons | Art Direction |
| Directing | Lesley Selander | Assistant Director |
| Sound | Jack Virgil | Orchestrator |
| Sound | Douglas Shearer | Sound Director |
| Art | Edwin B. Willis | Art Direction |
| Art | Joseph C. Wright | Art Direction |
| Costume & Make-Up | Dolly Tree | Costume Design |
| Sound | Paul Marquardt | Orchestrator |
