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Chloe (Thora Birch), a single mother, has her life turned upside down when her younger sister, Sadie (Caitlin Stasey), comes home after a long unexplained absence. Though Sadie seems to want to settle in with her sister and 17-year-old niece Nicole (Sasha Frolova), she’s actually a deeply disturbed young woman who has a sinister agenda regarding anyone who gets between her and her big sister.