Botanist, old Dr. Theo Praetorius has developed a curious cross-bred flower of strange beauty and aroma; but the plant only blooms during a full moon, and its fragrant juices yield remarkable properties, Instant healing of wounds, immediate energy & exhilaration, and the strange ability to discern another's thoughts. The Doctor's beautiful assistant, Jean Collins is unaware that Pretorius has been using the plant's miraculous powers to rejuvenate his crippled body. Meanwhile, the doctor's handsome young nephew, Bennet is Praetorious' only rival for Jean's affections. But as the Moon waxes full, the flower begins to blossom. Carl, the doctor's longtime associate, threatens to disclose Praetorius' evil plan and is murdered.