The Moth Diaries (film)

The Moth Diaries is a 2011 IrishCanadian horror film directed by Mary Harron and based on a 2002 novel of the same name by Rachel Klein.

But this year will never be the same. A mysterious, darkhaired girl named Ernessa Bloch Lily Cole, enrolls into the school. Lucy quickly becomes best friends with Ernessa and becomes distant from Rebecca. Ernessas presence makes Rebecca feel uneasy. She tries to confront Lucy about Ernessas dark secrets, but her pleas are dismissed as pure jealousy. Eerie things start to happen. First, Charley Valerie Tian gets expelled because of Ernessa. Dora Melissa Farman dies in a freak accident shortly after spying on Ernessas room, and a teacher is found murdered in the woods. Tension starts to grow at the school.To Rebecca, Ernessa is an enigma. She seems like she can walk through closed windows, and she is often seen lingering around the basement a place that all students are forbidden to go. Rebecca thinks Ernessa is a vampire. ........

Source: Wikipedia