A group of researchers gathering material for a magazine article on endangered wildlife encounter vampiric leopard women in the heart of the African jungle.

The legendary Loreley has been living for centuries in a grotto beneath the river Rhein in Germany. Every night when the moon is full, she turns into a reptile-like creature craving for human blood. When one girl after another of a nearby boarding school is killed by her, a hunter named Sirgurd is engaged to kill the monster