In the United States alone, 12 million people die, almost instantly.
Energy executive Martin Fall is with his family in Denver on the day of The Catastrophe. Miraculously left alive, he begins the long journey home to Los Angeles, as society begins collapsing all around him. Within months, the city becomes an armed compound, teeming with 80 million migrants fleeing for the safety of lower altitudes. Fall is lost among them, struggling for a reason to go on.
But soon he has no choice. Trapped in a web of lies from those he trusted, allied with others he barely knows, he must risk his life for a technology he scarcely comprehendsone that may be the world's only salvation.