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.

Tough-as-nails Dakota Sloane has spent her life running from the past. A man haunted by secrets, Logan Garcia has only one goal: to drink himself into oblivion. When a bomb detonates over Miami, utter anarchy erupts. Dakota knows of a safe house deep in the Everglades, but she needs Logan's help to survive the chaos. But the radiation isn't the only threat. At every turn, deadly foes are determined to stop them. As a diabolical conspiracy emerges, Logan and Dakota must prepare for the fight of their lives against an enemy more powerful than they could ever imagine.

Isaac Race thought he'd found a new family and home. A new Life. He had, but it's all about to be snatched away. When an ambitious enemy launches a sneak attack on the USA, his peaceful life is shattered and Isaac, by his very nature a loner, must band together with a ragtag group of survivors to make their way to a sanctuary, three states away in the depths of a vicious east coast winter.

Waiting to be deployed on a critical mission, elite Marine Raider Matthew Redd stops to help a stranger and wakes up hours later to learn his team was wiped out in an ambush. Unable to remember anything, Redd can’t deny the possibility that he’s somehow responsible for the information leak that led to the massacre. He’s given a deal to avoid a charge of treason, but it means walking away from the Corps and the life he loved. As he faces his loss, Matty gets a cryptic message from his adoptive father, J. B.: “Trouble’s come knocking. . . . Might need your help.”

John Eric Carver and Shrek are a retired Navy SEAL war dog team, now living in the mountains outside of San Diego. Both man and dog thought their life was now settled, finding peace on the 40-acre ranch they had moved to. But life, and a mutated virus, changed all that.