The story takes place a planet much like this, in a time much like now. There are a few differences. Here, solar flares knocked out many satellites and sections of the power grid. Massive earthquakes and tsunamis destroyed coastal Europe and the East Coast of the United States. More quakes, tsunamis, and volcanic eruptions ruined the Pacific coast. Soon, another quake flattened everything along the Mississippi from St. Louis to Memphis.
It was more than nature against mankind, with limited nuclear warfare in Asia. Mexican drug cartels invaded the American Southwest. A terrorist nuke took out most of New York City. The government responded by shutting down all coal and oil facilities in the country.
Lyle and his wife, largely self-sufficient, survive on a small ranch in Nebraska. They need some things, but with no gas, the fifteen miles to the store is a problem. Lyle’s solution is to ride a half-trained stallion. He discovers cannibals between his ranch and town. That messes with his quiet rural lifestyle.
Soon, however, he finds the cannibals are the least of his problems.