Glimpton

In Rosewood, majestic estates sprawl for acres, and Tiffany toggle bracelets dangle from every girl's wrist. But not all that glitters is gold, and the town harbors secrets darker than anyone could imagine, like the truth about what really happened the night Alison DiLaurentis went missing....

Shortly before her 17th birthday, Emma discovers she has a long-lost twin named Sutton Mercer. She contacts Sutton, who agrees to a rendezvous but never shows up. Curious at first, Emma slips into Sutton's ultra-glamorous life, assuming her identity. When it becomes clear that Sutton is not coming back, that someone made sure she never could, Emma plunges in to investigate who could have wanted her sister gone (a fairly long list, she discovers).