Dahlia 16 is one of five thousand girls created from a single genome to work for the greater good of the city. Trigger 17 thinks she's interesting. Beautiful. Unique. Which means he must be flawed. When Dahlia can't stop thinking about 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. They'll all be recalled-- and destroyed. Suddenly the girl who always follows the rules is breaking them, one by one by one.