When a young girl returns home from school to find her house ransacked and her young brother missing, the only clue is a mysterious figure lurking by the woods. After giving chase, the girl disappears and the town is put under curfew. But when two brothers break the rules, they unwittingly stumble across an old treehouse, deep in the woods, and find themselves right in the middle of an unimaginable nightmare. Inside they find the missing girl, hiding. Together they will face a fight for survival against an unexpected and bone-chilling evil.