In a quiet Washington state town, life is disrupted when paratroopers descend from the sky, heralding the beginning of a surprise invasion by North Korean forces. With their town captured and the United States under siege, recently returned Marine Jed Eckert and his brother Matt find themselves trapped behind enemy lines. As the invaders solidify their grip on the town, imposing martial law and taking over central points like the local police station, the brothers narrowly escape to their father's cabin in the woods.

Struggling to come to terms with the chaos, Jed, Matt, and a group of their friends and fellow students decide to fight back. They form a guerrilla resistance group, dubbing themselves the Wolverines after their high school mascot. The fledgling fighters embark on daring attacks against the occupying forces, using hit-and-run tactics to disrupt communications and supply lines, and inspire hope in the beleaguered townspeople. As they grow bolder, the Wolverines attract the attention of the occupation's commanders, who become intent on crushing the rising insurgency.