Sixteen-year-old Samantha Riley thought her biggest problem was a fight with her best friend—until she saw her mother in two places at once. When her twin brother, Stone, reveals the impossible truth—that he can transform into other people—Sammy's world unravels. And when she discovers she has the same power, she realizes they're not ordinary teens at all. They were created in a lab. Hunted by Dr. Jasper, the brilliant but dangerous scientist who engineered them, Sammy and Stone are forced to trust Jason, a mysterious older teen with powers of his own. Together, they must track down others like them before Jasper finds them first. But every ally they recruit brings new risks, and every decision could cost them their freedom—or their lives. Secrets made them. Powers changed them. Now survival will define them.