My killer is out there. And my sister might be next. Two months before I died, my best friend's brother disappeared. I have no idea where Thayer went or why he left, but I know it's my fault. I did a lot of horrible things while I was alive, things that made people hate me, maybe even enough to kill me. Desperate to solve my murder, my long-lost twin, Emma, is pretending to be me and unraveling the many mysteries I left behind—my cryptic journal, my tangled love life, the dangerous Lying Game pranks I played. She's uncovered my friends' darkest secrets, but she's never had the chance to dig into Thayer's past—until now. Thayer's back and Emma has to move fast to figure out if he's after revenge . . . or if he's already gotten it. From Sara Shepard, the #1 New York Times bestselling author of the Pretty Little Liars books, comes a riveting series about secrets, lies, and killer consequences.