"In the dazzling conclusion to the Greystone Secrets series from New York Times bestselling author Margaret Peterson Haddix, the Greystones and their doubles, the Gustanos, must team up to save the alternate world--before both worlds are lost. All secrets are revealed in this page-turning, suspenseful story that shows the importance of teamwork, telling your story, and taking action when it matters most." --

The words have sent chills down Tally's spine since her days as a repellent, rebellious Ugly. Back then Specials were a sinister rumor, frighteningly beautiful, dangerously strong, breathtakingly fast. Ordinary Pretties might live their whole lives without meeting a Special. But Tally's never been ordinary and now she's been turned into one of them. A superamped fighting machine, engineered to keep the Uglies down and the Pretties stupid. The strength,...