It's a fairly simple story. A young man's sister is kidnapped. He gathers an unlikely crew to rescue her. The wonder of this book is in the details of the time and place where it takes place is set: East Texas, when most people still ride horses and automobiles are just beginning to appear.
Essentially the book is one long chase. Along the way we get to know a lawless land. European settlers skirmish with Commanche. Gangs of psychopaths on horseback overrun homesteads, take what they want, and leave no witnesses. In the towns and on the roads, violence rules.
The details are not pleasant. This is the stuff of nightmares. But the author, Joe R. Lansdale, makes it worth reading by revealing the ideals, failings, regrets, and hopes of his principal characters. These are real people.