Sheridan Le Fanu's Carmilla.

Carmilla is a Gothic novella by Joseph Sheridan Le Fanu and one of the early works of vampire fiction, predating Bram Stoker's Dracula (1897) by 26 years. First published as a serial in The Dark Blue (1871-72), the story is narrated by a young woman preyed upon by a female vampire named Carmilla, later revealed to be Mircalla, Countess Karnstein.