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Mattie can't remember a time before she and William loved 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.