Young babysitter Amanda arrives at the Lloyd residence to spend the evening looking after their young son. Soon after the Lloyds leave, a series of frightening occurrences in the gloomy old house have Amanda's nerves on edge. The real terror begins, however, when the child's biological father appears after recently escaping from a nearby mental institution.

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.

International man of mystery Diabolik and his sensuous lover Eva Kant pull off heist after heist, all while European cops led by Inspector Ginko and envious mobsters led by Ralph Valmont are closing in on them.