In early 19th century Styria, a beautiful blonde (Kirsten Lindholm) in a diaphanous gown materializes from a misty graveyard. Encountering the Baron Hartog (Douglas Wilmer), a vampire hunter out to avenge the death of his sister, the girl is identified as a vampire and decapitated. Many years later, a dark-haired lady leaves her daughter Marcilla (Ingrid Pitt) in the care of General Spielsdorf (Peter Cushing) and his family in Styria. Marcilla quickly befriends the General's niece, Laura (Pippa Steel). Laura subsequently suffers nightmares that she is being attacked, and dies of a gradual sickness; whereupon Marcilla departs.