When the end came, the world was divided. Those considered perfect, the Pure, sheltered inside the controlled Dome. Outside, the Wretches struggled in a destroyed world, crippled by the fusings that branded them after the apocalypse that changed everything. Partridge, a Pure, has left the safety of the Dome in search of the truth. Pressia, a Wretch, is desperate to decode the secret that will cure her people of their fusings forever. Together, they must seek out the answers that will save humankind, and prevent the world's annihilation. But the betrayal of Partridge's departure has not been forgotten. As the Dome unleashes horrifying vengeance upon the Wretches in an attempt to get Partridge back, Partridge has no choice but to return to face the darkness that lies there, even as Pressia travels to the very ends of the world to continue their search.