A shocking thriller by the bestselling author of Girls of Glass. It seems like an open-and-shut case for FBI special agent Lucy Thorne when Eliza Cook walks into the field office. The teenage girl confesses to murdering a young boy. Disturbingly composed, she reveals chilling details only the killer could know. Beyond that Eliza doesn't say another word, leaving a vital question met with dead silence: Why did she do it? To...