The year is 2055. Surface civilization collapsed under the combined weight of war, economic ruin, and plague, and what remains of humanity now exists in the subway systems buried beneath the ruined cities. Jack Harper is a tired scout who lost his home station and everyone in it. Navigating the underground means threading through the conflict between the ruthless Family and the idealistic Communards, evading mutated creatures in the tunnels, and making moral choices that determine the survival of entire stations. From the fortified hubs to the irradiated surface during desperate scavenging runs, every mission — a murder investigation, a monster breach, a supply extraction — shapes Jack's reputation and determines whether the last flicker of human civilization holds on or finally goes out.