In the heart of Styria the Karnstein Family, even after their mortal deaths, rise from their tombs spreading evil in the countryside in their lust for fresh blood. Baron Hartog whose family are all victims of Karnstein vampirism, opens their graves and drives a stake through their diabolical hearts. One grave he cannot locate is that of the legendary beautiful Mircalla Karnstein. Years of peace follow that grisly night until Mircalla reappears to avenge her family's decimation and satisfy her desire for blood.

In 1830, the Karnstein heirs use the blood of an innocent to bring forth the evil that is the beautiful Mircalla - or as she was in 1710, Carmilla. The nearby Finishing School offers rich pickings not only in in the blood of nubile young ladies but also with the headmaster who is desperate to become Mircalla's disciple, and the equally besotted and even more foolish author Richard Lestrange.

While dabbling in Satanism, Count Karstein resurrects Mircalla Karnstein who initiates him into vampirism. As a rash of deaths afflicts the village, Gustav the head of Puritan group leads his men to seek out and destroy the pestilence. One of his twin nieces has become inflicted with the witchcraft but Gustav's zeal and venom has trapped the innocent Maria, threatening her with a tortuous execution, whilst Frieda remains free to continue her orgy of evil.