In London during World War II, a vampire named Armand Tesla wreaks havoc, feeding on innocent victims and spreading terror. Tesla is eventually tracked down and staked through the heart by Dr. Walter Saunders and Lady Jane Ainsley, who bury him in a cemetery, believing they have rid the world of his evil for good. Years later, during the Blitz, a bomb hits the cemetery, dislodging Tesla’s grave and allowing his werewolf servant, Andreas, to remove the stake. Revived, Tesla returns to exact revenge on those who tried to destroy him.

As Tesla resumes his deadly activities, Lady Jane realizes the vampire is back and is determined to stop him once more. Accompanied by her son and a new generation of allies, she seeks to protect her loved ones and end the vampire's reign of terror. While Tesla uses hypnosis and manipulation to ensnare new victims and rebuild his power, the battle between good and evil intensifies. Lady Jane and her companions must confront their fears and face the ancient horror once more to prevent Tesla from plunging London into eternal darkness.