Lust For a Vampire

Lust For a Vampire (also known as Love for a Vampire or To Love a Vampire (the latter title was used on American television)) is a 1971 British Hammer Horror film directed by Jimmy Sangster, starring Ralph Bates, Barbara Jefford, Suzanna Leigh, Michael Johnson, and Yutte Stensgaard. It was given an R rating in the United States for some violence, gore, strong adult content, and nudity. It is the second film in the so-called Karnstein Trilogy loosely based on the J. Sheridan Le Fanu novella Carmilla. It was preceded by The Vampire Lovers (1970) and followed by Twins of Evil (1971). The three films do not form a chronological development, but use the Karnstein family as the source of the vampiric threat and were somewhat daring for the time in explicitly depicting lesbian themes.

Plot
In 1830, at a finishing school in Styria, Mircalla arrives as a new student. A visiting author, Richard Lestrange, instantly falls in love with her; but Mircalla is a vampire—Carmilla Karnstein—who has been resurrected by her vampiric family. As students in the school, inhabitants of the nearby village and those who suspect Mircalla is responsible start to die, suspicion turns toward the Karnsteins and their ominous castle.