Daughters of Darkness

Les lèvres rouges is a movie starring Delphine Seyrig, John Karlen, and Danielle Ouimet. While passing through a vacation resort, a newlywed couple encounters a mysterious, strikingly beautiful countess and her aide.
Ostend, Belgium. In a decadent seaside hotel, Stefan and Valerie, a newlywed couple, meet the mysterious Countess Báthory and Ilona, her secretary.