The Moth Diaries (film)  The Moth Diaries is a 2011 thriller film directed by Mary Harron, based on the 2002 novel of the same name by Rachel Klein. The film stars Lily Cole, Sarah Gadon, Sarah Bolger, Judy Parfitt, and Scott Speedman. At an exclusive boarding school for girls, 16-year-old Rebecca writes her most intimate thoughts in a diary. Two years earlier, Rebecca's father, a poet, took his own life by slitting his wrists. Her mother transferred Rebecca to the school, hoping to help her daughter escape the memory of her father's death. With the help of her best friend and roommate, Lucy, Rebecca soon recovers. The following year, a mysterious, dark-haired girl named Ernessa Bloch enrolls into the school. Lucy quickly becomes best friends with Ernessa and becomes distant from Rebecca. Ernessa's presence makes Rebecca feel uneasy. She tries to confront Lucy about Ernessa's dark secrets, but her pleas are dismissed as jealousy. Eerie things start to happen. First, Charley gets expelled because of Ernessa. Dora dies in a freak accident shortly after spying on Ernessa's 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 students are forbidden to go). Rebecca thinks Ernessa is a vampire. Ernessa slowly gets rid of Rebecca's close friends, leaving Rebecca to find out what is happening by herself. A new English teacher, Mr Davies, arrives at the school. Mr Davies shows particular interest in Rebecca. The two share ideas on Romantic literature and poetry. Rebecca soon learns that vampires do not necessarily drink blood, but they can drain the lively spirit out of their victims. Mr Davies addresses himself as a fan of Rebecca's poet father. Rebecca turns to Mr Davies for help, and, during their conversation, the two kiss but Rebecca pulls away. Ernessa confronts Rebecca in the library and presents her with a sharp razor and elaborates on the pleasure of death. Another time, Ernessa sings a disturbing nursery rhyme about "The Juniper Tree" then slits her own wrists, causing blood to rain down on her and Rebecca. Afterwards, Ernessa and the blood disappear. Lucy is sent to the hospital, but only Rebecca knows that Lucy is sick because of Ernessa.