Gêmeas vão viver com o tio, num vilarejo, no qual à noite são vistas figuras femininas vagando. Os aldeões acreditam que o responsável por tudo é o Conde Karnstein, que mora num castelo. Mas elas acabam aproximando-se do castelo, a despeito da proibição do tio.
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.
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.
An innocent project transforms into a perilous nightmare when researcher Susan Roberts arrives in France in search of information on a deceased composer. She contacts his widow whose mental deterioration, precipitated by the death of her husband, manifests itself in psychotic dementia. The young woman's arrival triggers an obsessive desire to marry her crippled son to Susan, ensuring by this union that the genius of the father will be passed on to future generations.
