Daughters of Darkness is a 1971 erotic horror film co-written and directed by Harry Kümel and starring Delphine Seyrig, John Karlen, Andrea Rau, and Danielle Ouimet. Set in a nearly deserted seaside hotel in Belgium, the film follows a newlywed couple who encounter a mysterious Hungarian countess, Elizabeth Báthory, and her enigmatic companion. As tensions rise, the couple is drawn into a disturbing psychological and sexual game, with fatal consequences.