After the death of their absentee father, Aaron and Bridge Quinlan travel to a vast rainforest property in the Pacific Northwest to hear the reading of his will. There, they meet up with their mother and troubled sister, Franny, and are shocked to discover the will's terms: in order to claim their inheritance they must all remain at the estate for thirty days without any contact with the outside world. Despite their concerns, they agree. The Quinlans soon come to learn their family has more secrets than they ever imagined--revelations that at first inspire curiosity, then fear. Why does Bridge have faint memories of the estate? Why did their father want them to be sequestered there together? And what is out there they feel pulling them into the dark heart of the woods?