Mattie can't remember a time before she and William lived alone on a mountain together. She must never make him upset. But when Mattie discovers the mutilated body of a fox in the woods; she realizes that they're not alone after all. There's something in the woods that wasn't there before; something that makes strange cries in the night; something with sharp teeth and claws. When three strangers appear on the mountaintop looking for the creature in the woods; Mattie knows their presence will anger William. Terrible things happen when William is angry.