All her life, Cassia has never had a choice: The Society dictates everything, including when and how to play, where to work, where to live, what to eat and wear, when to die, and most importantly to Cassia as she turns 17, whom to marry. When she's matched with her best friend Xander, things couldn't be more perfect, but why did her neighbor Ky's face show up on her match disk as well?

Seventeen-year-old Cassia has always trusted the Society to make the right choices for her, but when there is a "glitch" at her Matching ceremony, she is torn between marrying her best friend and a new love, which could bring disaster.

Con su amor, Cassia y Ky han quebrantado las inflexibles normas de la Sociedad y ahora deben asumir las consecuencias. El castigo para ella es olvidar todo lo sucedido y empezar de nuevo en otra ciudad, donde ha sido reubicada junto con su familia. Ky, sin embargo, no ha tenido tanta suerte: las autoridades lo han deportado a las Pro-vincias Exteriores para que actue como escudo humano en una guerra que quiza ni exista. Lo unico seguro es que antes...