Twins Of Evil
1971

After the death of their parents in Vienna, twins Maria and Frieda Gellhorn move to Karnstein to live with their aunt and uncle, Cathy and Gustav Weil.

Gustav Weil is an insanely devoted witch hunter who spends his nights searching for suspected agents of the devil and extinguishing them. His greatest foe is Count Karnstein, who practices the black arts under the protection of the Emperor.

When Karnstein sacrifices a young woman, the blood runs through a crack in the table, under which is the tomb of Marcilla Karnstein. Marcilla is thus resurrected and makes the Count a vampire.

Aunt Cathy enrolls the girls in a school. Anton Hoffer, the choirmaster, immediately takes a liking to Frieda. Frieda, however, finds Count Karnstein more to her liking, and one night she sneaks out to his carriage and is taken to his castle. Here she is made a vampire.

When Gustav finds that Frieda is a vampire, after he sees her attacking a man, he condemns her to death and goes home for Cathy. Cathy will not allow him to take Maria and let her be burned as a witch.

Meanwhile, Karnstein abducts Maria and swaps her for Frieda. While the witch hunters are preparing to burn Frieda( who happens to be Maria ), Anton goes to see Maria and recognises that it is Frieda. He tries to tell Gustav but he does not believe him.

Can Anton save Maria in time?