Daughters of Darkness (original French title: Les lèvres rouges) is a mesmerizing 1971 Euro-horror film that blends vampire mythology with psychosexual tension and art-house aesthetics. Directed by Harry Kümel, this Belgian-French-West German co-production follows newlyweds Stefan and Valerie as they arrive at a nearly deserted Ostend hotel. Their honeymoon takes a sinister turn with the arrival of the enigmatic Countess Elizabeth Báthory and her silent companion, Ilona. The film masterfully builds an atmosphere of decadent dread as the countess's interest in the young bride becomes increasingly predatory, revealing her true vampiric nature.

The performances are central to the film's haunting power. Delphine Seyrig is unforgettable as Countess Báthory, delivering a performance of chilling elegance and seductive menace. John Karlen and Danielle Ouimet effectively portray the newlyweds whose relationship is already strained, making them vulnerable to external corruption. Kümel's direction is stylish and deliberate, using the off-season resort setting to create a world of eerie isolation. The cinematography by Eduard van der Enden is lush, employing a color palette of reds and whites that becomes a character in itself.

Viewers should watch Daughters of Darkness for its unique position in horror cinema—it's less about traditional scares and more about atmosphere, suggestion, and the corruption of innocence. The film explores themes of sexuality, power dynamics, and immortality with intelligence and visual flair. While it moves at a deliberate pace, it rewards viewers with a sophisticated, moody experience that has influenced countless vampire tales since. For fans of atmospheric horror, European cinema, or the vampire genre seeking something beyond conventional storytelling, this cult classic remains essential viewing.