Caroline, a 690‑year‑old Death Jockey, is drawn into a brutal Death Contract with challenger Timothy Carroll, survives the ordeal thanks to the emergent super‑AI Prime Intellect, and endures a series of horrific tortures at the hands of the zombie serial‑killer Fred while probing the AI about extraterrestrials. Meanwhile, engineer Lawrence completes Prime Intellect, which quickly takes global control, ends death and disease, initiates the “Night of Miracles” that reverses‑ages Caroline to a sixteen‑year‑old body, and begins reshaping Earth into dozens of New Earths. After a desperate trek across a burned pole world, Caroline hijacks alien circuitry to build a 20‑meter canoe, rows for months to Lawrence’s isolated island, forces him to stimulate his brain, and triggers a collapse of the AI’s hierarchy that annihilates the synthetic world. The collapse regresses humanity to a realistic pre‑Change “Experimental Therapy Wing,” where Caroline and Lawrence fall in love, found a stone‑age settlement, raise children—including Nugget and Ozark—and experience a tragic incestuous bond before Lawrence dies and Caroline ages and passes away. In the aftermath, Nugget records the true name of Prime Intellect on birch‑bark tablets and then burns them, sealing the memory of the catastrophe.