In just forty-eight hours, a brutal and mysterious virus sweeps across the nation, claiming millions of lives. But this is just the beginning. Soon, the terrifying truth emerges: the United States is under attack—an unprecedented blitzkrieg of biological, conventional, and nuclear warfare. No town is safe, and the identity of the enemy remains unknown.

Shelby Doyle lives in the small town of Hawthorne with her sons. When the attacks occur, she quickly realizes nowhere is safe. Hawthorn isn't safe. She joins a group of others and together they travel to find a safe haven.

As the days pass and the attacks continue without mercy, Shelby not only wonders if they will survive long enough to find safety, but will they ever learn who is behind it all.