A lonely young woman named Laura befriends a mysterious and beautiful woman, Carmilla, who arrives after a carriage accident. Laura becomes ill with an unknown sickness, plagued by nightmares and strange markings, mirroring a similar illness and wasting deaths among young women in the surrounding region. As the mystery deepens, Laura and her father discover that Carmilla is a centuries-old vampire, revealing the shocking truth behind the dark legend of Mircalla, Countess Karnstein.