When the time comes for Cassia to be matched she is told her future husband is a childhood friend named Xander. However, she is also matched with Ky, a somewhat mysterious boy who lives in her neighborhood. Cassia is told this second match was a mistake, Xander is her future husband, no discussion. But this mistake opens up a new way of thinking for Cassia, she has never considered that the Society makes mistakes, if they made this mistake what´s to say they haven´t made mistakes before? And maybe, just maybe she wants to be able to decide who she´ll spend her life with all on her own.