 Botanist, old Dr. Theo Praetorius (Vincent Weir) 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 (Freda Kane) 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 (Grant, Reed) is Praetorious  only rival for Jean s affections. But as the Moon waxes full, the flower begins to blossom. Carl (John Rennie), the doctor s longtime associate, threatens to disclose Praetorius  evil plan and is murdered.