After a young Wretch is abducted by the Dome and cleansed of her fusings and imperfections, she is only able to repeat the Dome's latest message: We want our son returned. This girl is proof that we can save you all. If you ignore our plea, we will kill our hostages one at a time. Willux will go to any lengths to get his son Partridge back, including murder. Partridge sacrifices himself and returns, in the hope of taking over the Dome from within, only to uncover more of his father's chilling, dark secrets. Outside the Dome, Pressia, Bradwell, and El Capitan are decoding the secrets from the past - tucked away in one of the Black Boxes - to uncover the truth that might set the wretches free of their fusings forever. Those fighting Willux will be pushed over boundaries, both land and sea, heart and mind, in their quest - further than they ever imagined.