It is 2032, twenty years after the end of World War III. The survivors of the nuclear holocaust fled underground to vast bunker cities built beneath the contaminated surface. Life in the shelters has not been safe—mutants, mercenary factions, and other threats fill the decaying corridors. A psychologist named Albert Tokaj, struggling to hold himself together in the cramped dark, is about to discover that the most dangerous thing in Grace shelter is not what lurks in the tunnels.