The Loreley's Grasp (1974)
The Loreley's Grasp
Directed by Amando de Ossorio
Cast: Tony Kendall, Helga Lineand Silvia Tortosa
Also titled, “When the Screaming Stops.” 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.