Thesecond novel in Peter Clines bestselling Ex series. Its been two years since the plague of ex-humans decimated mankind. Two years since the superheroes St. George, Cerberus, Zzzap, and Stealth gathered Los Angeles s survivors behind the walls of their fortress, the Mount. Since then, the heroes have been fighting to give the Mount s citizens hope, and something like a real life. But now supplies are growing scarce, the zombies are pressing in . . . and the heroes are wondering how much longer they can hold out. Then hope arrives in the form of a surviving US Army battalion--and not just any battalion. The men and women of the Armys Project Krypton survived the outbreak because they are super-soldiers, created before mankinds fall to be better, stronger, faster than normal humans--and their secure base in Arizona beckons as a much needed refuge for the beleaguered heroes and their charges. But a dark secret lies at the heart of Project Krypton, and those behind it wield an awesome and terrifying power.