When Alison disappeared after a slumber party, not to be seen since, her friends at the elite Pennsylvania school mourned her, but they also breathed secret sighs of relief. Each of them guarded a secret only Alison had known. Now they have other dirty little secrets, secrets that could sink them in their gossip-hungry world. When each of them begins receiving anonymous emails and text messages, panic sets in. Are they being betrayed by someone in their circle? Worse yet: Is Alison back?