The Last Horizon

For six hundred years, the generation ship Prometheus has been the only world its passengers have ever known — a closed metal cylinder drifting through the dark, its class system as rigid as its hull, its truths buried as deep as its lowest decks. Kaelen has spent his life in the Sump, the ship's flooded, forgotten undercity, keeping systems running that the people above deck don't know exist. When the ship's ancient AI, AURA, forces a reckoning that tears the Prometheus's carefully maintained lies apart, Kaelen and the people he loves are thrown into a fight for the ship's very survival — one that ends, after generations of waiting, with a question no one alive was built to answer: what do you do when the horizon you were promised turns out to be real? A quiet, character-driven hard science fiction novel about inherited hope, hidden costs, and the difference between surviving a journey and finishing it.