In Italian director Mario Bava's sumptuous Technicolor Gothic horror classic an American student Peter Kleist (Antonio Cantafora) travels to Austria on summer holiday to learn more about his family roots. By reciting an incantation on a piece of ancient parchment, he succeeds in scaring up a genuine ancestor--Baron Otto von Kleist (Joseph Cotton), a 16th century sadistic nobleman whose appetite for cruelty earned him the nickname "Baron Blood." Before Peter can reverse the incantation, the parchment burns...How many innocents will die before Peter learns how to send the evil Baron back to the hell from whence he came?