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A 16-year-old student (Sarah Bolger) at an exclusive girls' boarding school jots down her most personal thoughts and feelings in a diary. She begins to record the comings and goings of her roommate, Lucy/104947/">Lucy Blake (Sarah Gadon), who has just made friends with a strange new boarder, Ernessa (Lily/76933/">Lily Cole).

With her pale skin and hypnotic eyes, Ernessa gives off a mysterious, moody aura. Rumors, suspicions and secrets involving the new student spread through the school as a series of frightening disasters occur.

  Canadian Connection: Filmed in Montreal, Quebec.