One night in their suburban childhood, Tyler Dupree and his friends the twins Jason and Diane Lawton watch the stars go out, as a black membrane closes around the Earth and cuts the planet off from the sky. The barrier, soon called the Spin, imposes a staggering time differential: outside it, roughly a hundred million years pass for every year on the ground, so that the ageing sun will swell and consume the Earth within a single human lifetime. As the three grow up, brilliant Jason drives the scientific response from the aerospace firm Perihelion, including a desperate scheme to terraform and seed Mars in geological blinks of Earth time, while Diane turns toward apocalyptic religion and Tyler, become a doctor, remains the steady witness between them. Wilson, a writer praised for grounding cosmic ideas in ordinary emotional lives, structures the book around that intimacy, and reviewers judged the human story its real strength even where the physics stretched credulity. The mystery of who imposed the Spin, and why, deepens as the deadline nears. It is really a novel about living under a certain ending, and about faith, love and endurance in the shadow of extinction.