This is one of three Hammer films loosely based on Sheridan LeFanu's book Camilla, which gives the standard vampire story a lesbian twist. The other two films are The Vampire Lovers and Twins of Evil. In this film, Count Karnstein, through a magical ritual, relies on the feedings of the newly re-fleshed and voluptuous vampire Mircalla (Yutte Stensgaard) for his own sustenance. This keeps her very busy indeed. She finds a ready supply of victims at a girls' finishing school. Her troubles begin when two male teachers from the school decide to investigate.