An ancient evil...an ungodly ritual...a boy thrust into a living nightmare. When fourteen-year-old Ryan Perry moves to his grandmother's coastal home in South Carolina, he is haunted by a malevolent entity masquerading as his double—a specter of ancient evil intent on destroying Ryan. As the hauntings become dangerous, Ryan encounters an additional threat: two menacing feral boys and their caretaker somehow connected to this other twin. Ryan realizes that in order to save himself and his family, he must confront the all-too-real presence of an unimaginable evil.