The novel is a poignant tale set in the 1920s post-World War I era, focusing on a group of American and British expatriates living in Paris who travel to Pamplona, Spain for the annual Running of the Bulls. The story explores themes of disillusionment, identity, and the Lost Generation, with the protagonist, a war veteran, grappling with impotence caused by a war injury. The narrative is steeped in the disillusionment and existential crisis experienced by many in the aftermath of the war, and the reckless hedonism of the era is portrayed through the characters' aimless wanderings and excessive drinking.

The book presents a philosophical and introspective analysis of the classic literary character Don Quixote, delving into the existential and moral dimensions of his adventures. The author reflects on the nature of reality, the importance of ideals, and the interplay between sanity and madness, arguing that Quixote's chivalric quests and his refusal to concede to the limitations of his mundane world embody a profound and heroic affirmation of human imagination and spirit. Through this exploration, the work becomes a meditation on the human condition and the enduring power of fiction to inspire and give life meaning.

The book is a fictionalized account of the author's experiences in the criminal underworld of early 20th-century Europe. It is a narrative that delves into the life of a man who embraces his identity as a thief and a homosexual, exploring the intersections of crime, sexuality, and social defiance. The protagonist navigates through various relationships with fellow outcasts and criminals, while also confronting the moral codes of society. The work is known for its poetic and introspective prose, as well as its exploration of themes such as betrayal, freedom, and the search for beauty within the margins of society.