Underneath the frozen geodesic dome of Chicago, humanity clings to life around loud geothermal vents. Nate Kowalski, a deaf kinetic runner, navigates the sub-zero underbelly, delivering copper punch-cards across frozen gaps. He believes his dead father abandoned him, choosing to work the core rather than stay with his family. The authoritarian station warden, Charles Voss, schedules a server purge of the old historic family database to conserve power for the wealthy districts. Technician Penny Lane intercepts the bypass cards but needs Nate to physically sprint across the dying, frozen core before the purge lock closes. Nate plunges into the subterranean vents under absolute radio silence due to extreme EMP storm waves. The cold drains his body, and mechanical failures jam his route. He is forced to pull off his insulated copper gloves to manually align frozen brass gear assemblies in the sub-zero dark, relying entirely on the physical vibrations of the shaking pipes to time his movements before his limbs freeze solid. Arriving at the manual annex, Nate defeats Voss's efforts to halt the override by locking the physical gears in place with his brass watch. The copper card reader reboots the core, printing not code, but the ink-on-paper letters of his father's final log—revealing his father's sacrifice to save him. The warmth returns to the dome as Nate holds the fresh, warm paper.