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The top 10 list is populated. The sponsorship program is open. The difficulty is ramping up. The first three floors were nothing compared to what Carl and Donut now face. The Iron Tangle. An impossibly complicated subway system built out of the world's subterranean railway systems, all combined and then tied together into a knot. Up is down.

A week after a cyber-attack crippled America's power grid, millions are dead - frozen by the worst winter storm in a century, irradiated by exploding nuclear power plants or murdered by ruthless criminals. Millions more starve and battle for survival amidst the ever-worsening conditions. Despite the long odds, ex-cop Nate Bauer is determined to do whatever it takes to reach his pregnant wife and family in Chicago.