When Art awakens to discover his left hand missing, he soon learns that isn't the worst part. No one, including his wife, remembers him ever having a left hand. His determination to prove something stole a piece of him and to get it back turns into an obsession that threatens his marriage and his job. Only one person believes his story. A one-handed mural artist named Heidi reveals the thing that stole Art's hand did the same to her two years earlier. The more he learns about the monster tormenting him, the more his life spirals.