In 2059, Earth's revolution has ceased, leaving one hemisphere bathed in perpetual sunlight and the other shrouded in eternal darkness. Humanity clings to survival within a narrow habitable zone. In isolationist Britain, Dr. Ellen Hopper receives a cryptic letter from a dying man, thrusting her into a world of clandestine politics and state secrets. As tensions escalate, Ellen's pursuit of the truth may not just alter her life, but also the fate of humanity in this chilling dystopian reality.