We have brown hair. Brown eyes. Fair skin. We are healthy and strong and smart. But only one of us has ever had a secret. Dahlia 16 sees her face in every crowd. She’s nothing special—just one of five thousand girls created from a single genome to work for the greater good of the city. Meeting Trigger 17 changes everything. He thinks she’s interesting. Beautiful. Unique. Which means he must be flawed. When Dahlia can’t stop thinking about him—when she can't resist looking for him, even though that means breaking the rules—she realizes she’s flawed, too. But if she’s flawed, then so are all her identicals. And any genome found to be flawed will be recalled. Destroyed. Getting caught with Trigger would seal not only Dahlia’s fate, but that of all five thousand girls who share her face. But what if Trigger is right? What if Dahlia is different? Suddenly the girl who always follows the rules is breaking them, one by one by one…

Dahlia 16's life is a lie. The city of Lakeview isn't a utopia that raises individuals for the greater good; it is a clone farm that mass-produces servants for the elite. And because Dahlia breaks the rules, her sisters—the 4,999 girls who share her face—are destroyed. She and Trigger 17, the soldier who risked his life for hers, go on the run, escaping into the wild outside the city walls. But it turns out Dahlia has one remaining identical, one who shouldn't even exist. Waverly Whitmore is teenage royalty, a media sensation with millions of fans who broadcasts her every move—including every detail of her wedding planning, leading up to the day she marries Hennessy Chapman. Waverly lives a perfect life built on the labors of clones like Dahlia. She has no idea that she too is a clone . . . until she comes face to face with Dahlia. One deadly secret. Two genetic sisters. And a world that isn't big enough for both of them.