In the dead of winter, an EMP attack destroys the U.S. power grid. No electricity. No cars or phones. The country is plunged into instant chaos. But for Hannah Sheridan, it's the best day of her life. For the last five years, she's been the captive of a sadistic psychopath—until the EMP releases the lock of her prison.

A rogue Russian nuke sails toward the harbors of Los Angeles in the hull of a ramshackle sailboat. Without destroying a single building, the bomb shatters the latticework of the American dream, toppling one piece of the economy after another. A group of Special Forces veterans and their prepper friends scramble for survival in a worldwide catastrophe so psychologically disruptive they are left questioning everything they ever believed to be true.

For dinosaurs, it was a big rock. For humans: Coronal Mass Ejection (CME). When the Earth is hit by the greatest CME in recorded history (several times larger than the Carrington Event of 1859), the combined societies of the planet's most developed nations struggle to adapt to a life thrust back into the Dark Ages. In the United States, the military scrambles to speed the nation's recovery on multiple fronts including putting down riots, establishing relief camps, delivering medical aid, and bringing communication and travel back on line. Just as a real foothold is established in retaking the skies (utilizing existing commercial aircraft supplemented by military resources and ground control systems), a mysterious virus takes hold of the population, spreading globally over the very flight routes that the survivors fought so hard to rebuild.

Jason Sterling had a simple life by all accounts. He had worked the same job his entire adult life, he had never married, and he had no children. He was used to doing things on his own. His comfortable life was shaken to the core the day he learned of his fathers death. It was a mysterious meeting that set life-altering events in motion, and the allure of a new life was too great to walk away from. When an electromagnetic pulse brings the modern world to its knees, Jason's choice proves to be the right one.

Ben Davis was prepared for disaster. He just didn't know it would come so soon. He and his teenage son Joel, are miles deep in the backcountry of the San Juan Mountains when high-altitude nuclear electromagnetic detonations light up the pre-dawn sky. Ben, Joel, and their dog, Gunner, must make their way home - or whatever's left of it - on foot.