An error—a momentary glitch in the perfect façade of the Society—set Cassia on a path of rebellion. Now, with silk and paper smuggled against her skin, she's ready to ignite the final chapter.

But as an incurable plague sweeps through the Society, time is running out. Cassia races to save the lives and freedom of those she loves.

Family, love, choice—the very things the Society has denied them—hang in the balance. Joined by Ky and Xander, Cassia returns to confront the oppressive regime.

Will they reclaim the power to choose before it's too late?