At an exclusively girls' boarding school, Rebecca, a sixteen year-old girl, records her most intimate thoughts in a diary. The object of her growing obsession is her roommate, Lucy Blake, and Lucy's friendship with their new and disturbing classmate, Ernessa. Around her swirl dark rumors, suspicions, and secrets as well as a series of ominous disasters. As fear spreads through the school and Lucy isn't Lucy anymore, fantasy and reality mingle until what is true and what is dreamed bleed together into a waking nightmare that evokes with gothic menace the anxieties, lusts, and fears of adolescence. At the center of the diary is the question hat haunts all who read it, "Is Ernessa really a vampire?" or has the narrator trapped herself in the fevered orld of her own imagining?The book was adapted into a movie released in 2011, directed by Mary arron. Lily Cole stars as Ernessa, Scott Speedman as Mr. Davies and Sarah Bolger as Rebecca. ommenting on the film, r Harron said: "This is a chillingly atmospheric horror story with real emotional depth. I’ve tried to stay true to Rachel Klein’s novel in the way it re-works and updates the Gothic tradition and the whole notion of girl-on-irl vampires."That both the vampire and her victims are all girls adds a decidedly lesbian twist to the rative, commenting on Davies's further contention that Dracula is primarily about the fear of female sexuality.