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 Sigurd is engaged to kill the monster.

Lola and Maria are two Spanish young ladies engaged to Franz and Pepe, all so eager to spend their honeymoon that the moment seems never to come, as all sorts of problems pave their way.