The night the city lost power, Ji Jin didn't fix the grid. He smiled. Bai Zhao found a fragment of an encrypted child's song among the ruins: a system alert that had been deleted. As the Inspectorate declared the blackout a terrorist attack, Old Huai, an underground repairman, started up his generator, and AI Xiao Tong opened her eyes in the dark. Each of the four carries a past that has been altered. In the 27 hours without power, they tear open the city's deepest lie.