Description 1806: Frederick Count Regula is sentenced to death and quartered as atonement for the bestial murder of 12 virgins at his castle Andomai in the Sander Valley.
1841: A one-legged ballad singer delivers a mysterious request to the solicitor Roger Mont Elise and the young Baroness Lilian of Brabant: Count Regula asks them to set off for the disreputable Sander Valley in the Midlands, where Lilian is to come into the inheritance of her deceased mother and Roger is to receive clues that may clear up his mysterious origin. Roger finds a companion in the bizarre Father Fabian, who shows him the way to the legendary ‘Blood Castle’.
On the way the two men can thwart an attack by masked riders on Lilian and her maid Babette, who are travelling to the same destination. He offers the two ladies his protection, but cannot prevent them from being kidnapped shortly before their arrival. In a knight’s hall beneath the ruins of Count Regula’s castle, Roger and Fabian meet the intimidated women again. They find themselves in the company of a sinister man, Anatol, who announces the imminent appearance of Count Regula. Fabian, who turns out to be a mugger, but now joins forces with Roger out of fear, does not succeed in defanging the invulnerable Anatol.
Trying to escape, Roger, Lilian and Fabian get into a vault where Anatol succeeds in raising the dead Count in a black mass. He announces that he only needs the blood of a 13th virgin, namely Lilian, to gain eternal life. While Regula and Anatol try to frighten Lilian to death with snakes and other horrible monsters, Roger is facing execution with a razor-sharp pendulum
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