Lights go out, planes fall from the sky, and gunfire erupts. Denver is burning.

McLean has the gear, the training, and a fortified retreat waiting in the Rockies. He's prepared for this. It's time to go. But there's someone in the city he just can't leave behind.

As Denver collapses into predatory chaos, McLean heads deeper into the kill zone to find a woman who was never part of his survival strategy. Until now.

To reach sanctuary, McLean and Carrie must navigate a societal meltdown and a mountain range filled with its own wild dangers. Learning to trust in their small band of friends—and in each other—is only the beginning. It's time to find out how deep their preparedness truly runs.