The monsters live inside of Kate Woodson. Chronic pain and a host of autoimmune diseases have robbed her of a normal, happy life. Her husband Andrew's surprise of their dream Maine lake cottage for the summer is the gift of a lifetime. It's beautiful, remote, idyllic, a place to heal. But they are not alone. Something is in the woods, screeching in the darkness, banging on the house, leaving animals for dead. Just like her body, Kate's cottage becomes her prison. She and Andrew must fight to survive the creature that lurks in the dead of night.