Marin Haggerty, the daughter of a notorious serial killer, was only a child when they arrested her father. Ripped from her home and given a new identity, Marin disappeared. Twenty years later, Gwen Tanner keeps everyone at a distance, preferring to satirize the world around her than participate in it. It’s for her safety—and theirs. But when someone starts sending body parts to her front door, the message is I Know Who You Are.