Dr. Paul Carruthers is frustrated because he thinks his employers, Mary Heath and Henry Morton, have cheated him out of the company's profits. He decides to get revenge by altering bats to grow twice their normal size and training them to attack when they smell a perfume of his own making. He mixes the perfume into a lotion, which he offers as a gift to Mary and Henry. When they turn up dead, a newspaper reporter decides to investigate.
Featured Crew
| Jean Yarbrough | Director |
| John T. Neville | Screenplay |
| George Bricker | Original Story |
| Paul Palmentola | Art Direction |
| Guy V. Thayer Jr. | Associate Producer |
| Holbrook N. Todd | Editor |
| Jack Gallagher | Producer |
| Melville De Lay | Production Manager |
| Arthur Martinelli | Director of Photography |
| Ferrol Redd | Sound Engineer |
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