The novel is a dark, poetic exploration of the criminal underworld in Paris, focusing on the life and fantasies of a homosexual prostitute and thief. The protagonist, while in prison, creates an elaborate fantasy world populated by outcasts, convicts, and murderers, including a transgender character who becomes his ideal of beauty and purity. The narrative is filled with graphic depictions of sex and violence, and explores themes of transgression, identity, and the transformative power of the imagination.

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.