The book tells the story of two retired Texas Rangers who embark on a perilous cattle drive from Texas to Montana in the 1870s. The narrative focuses on the duo's adventures and the characters they meet along the way, including a variety of outlaws, Indians, and settlers. This epic tale of the Old West explores themes of friendship, unrequited love, and the harsh realities of frontier life.

"The Crossing" is a novel set in the late 1930s and early 1940s that follows a young man named Billy Parham and his brother Boyd. The story primarily revolves around their adventures in the United States and Mexico, including their encounters with a wolf, horse traders, and a Mexican outlaw. The narrative explores themes of loss, survival, and the harsh realities of life, set against the backdrop of the American West and the Mexican wilderness.

"Cities of the Plain" is the conclusion to a trilogy set in the post-World War II American West. The story follows two cowboys, John Grady Cole and Billy Parham, who work on a ranch in New Mexico near the Texas border. Cole falls in love with a Mexican prostitute, which leads to a tragic confrontation with her pimp. The novel explores themes of love, friendship, and the fading of the old West.

The book explores the concept of the frontier throughout American history, arguing that it has been a central myth that has shaped the nation's ideologies and policies, from its inception to the present day. The author traces this myth from the country's founding, through westward expansion, to the current political climate and the contentious issue of the border wall. The book suggests that the frontier has served as a symbol of freedom and opportunity, but also of conflict and exclusion, reflecting the country's struggle with its own identity and values.