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.

Plot

Stefan Chilton, the son of an aristocratic British family who was raised in the United States, is traveling with his new wife, Valerie, through Europe. The couple check into a grand hotel on the Ostend seafront in Belgium, intending to catch the cross-channel ferry to England, where Stefan's mother lives. Valerie notices that Stefan is reluctant to phone his mother, who is unaware of the couple's marriage. Because it is winter, the hotel is empty aside from Stefan and Valerie. At nightfall, a mysterious Hungarian countess, Elizabeth Báthory, arrives in a Bristol driven by her "secretary", Ilona. Elizabeth requests the royal suite, but the hotel's middle-aged concierge, Pierre, tells her it is occupied by the honeymooning couple. He also remarks having seen the countess at the same hotel when he was a child, and observes that she has not aged. Elizabeth takes the adjoining suite, and appears fixated on the young couple. In their suite, Valerie reads a local newspaper article about a series of child murders in Bruges, each a girl whose throat was slashed.