In search of a future that may not exist and faced with the decision of who to share it with, Cassia journeys to the Outer Provinces in pursuit of Ky — taken by the Society to his certain death — only to find that he has escaped, leaving a series of clues in his wake. Cassia's quest leads her to question much of what she holds dear, even as she finds glimmers of a different life across the border. But as Cassia nears resolve and certainty about her future with Ky, an invitation for rebellion, an unexpected betrayal, and a surprise visit from Xander — who may hold the key to the uprising and, still, to Cassia's heart — change the game once again. Nothing is as expected on the edge of Society, where crosses and double crosses make the path more twisted than ever.