The world didn’t end when the meteors came; it changed.
We meet Grey in the process of killing three people intent on robbing and murdering him. The deaths solve nothing; instead, what he finds on one of the bodies leads to a bloody trip through the wreckage of a world scarred by a near-apocalypse, and inward through his own memories. In the process he becomes involved in a plan that could mean the return of the world he knew as a child, in the time before the Fall.
During his trek from British Columbia into the former United States he must overcome both his own bleak memories and the murderous forces of an old friend. The lessons he takes away and the decisions he makes will determine not only if he has a future, but whether civilization does.