The final novel. The entity beyond the gates is accelerating its campaign and the only solution anyone can find would end human individuality as a concept. Holden, Naomi, Amos, and Bobbie face the end of the story they have been living for forty years. The series concludes the way it began - with a small crew on a single ship, a problem too large for any of them, and the stubborn insistence that it matters how you behave even when the stakes are civilisational.