Let Me In (2010)

Twelve-year old Owen is viciously bullied by his classmates and neglected by his divorcing parents. Achingly lonely, Owen spends his days plotting revenge on his middle school tormentors and his evenings spying on the other inhabitants of his apartment complex. His only friend is his new neighbor Abby, an eerily self-possessed young girl who lives next door with her silent father. A frail, troubled child about Owens’s age, Recognizing a fellow outcast, Owen opens up to her and before long, the two form a unique bond. When Abby’s father disappears, the terrified girl is left to fend for herself. Still, she rebuffs Owen’s efforts to help her, leading the imaginative Owen to suspect she’s hiding an unthinkable secret.