"It isn't natural for you to be younger than your great-grandchildren. We messed around with nature, and we shouldn't have." Melly and Anny Beth both lived normal lives throughout the twentieth century. But in 2000, when they are old and ready to die, they are selected to participate in Project Turnabout and are given an injection to make them grow younger. At some point these participants are to receive another injection, which will stop the unaging process. But everyone who receives the second shot dies. Now, in 2085, Melly and Anny Beth are both in their teens and living on their own. They know they will need someone to take care of them when they grow too young to care for themselves. Time is running out. In this spellbinding race against time, award-winning author Margaret Peterson Haddix explores a scientific experiment gone wrong, and the morality of immortality.