When a young girl returns home from school to find her house ransacked and her toddler brother missing, she notices a mysterious, shadowy figure lurking by the woods. After giving chase, the girl disappears and the town is put under curfew. But two brothers break the curfew and go deep into the woods where they stumble across an old treehouse and find themselves in the middle of an unimaginable nightmare. They find the missing girl hiding in the house and join her in a fight for survival against an unexpected and bone chilling evil.