The rise and inevitable fall of Nana, a courtesan who embodies the moral decay of the Second French Empire, serves as the catalyst for Zola's examination of societal hypocrisy. Nana, the daughter of a laundress, navigates the opulent and treacherous landscape of 1867 Paris, utilizing her beauty and influence to manipulate the elite who surround her. Her objective is to secure status and wealth within a world that simultaneously desires and despises her. Opposing her are the rigid social structures and the inherent corruption of the aristocracy, which Zola depicts through a third-person narrative that maintains a clinical, observational distance from its subjects.

Readers and critics frequently highlight Zola's unflinching commitment to the principles of Naturalism, noting how he treats his characters as subjects in a controlled social experiment. Discussion often centers on the stark contrast between the glittering surface of Parisian high society and the underlying rot that Zola meticulously exposes. Many observers point to the effectiveness of the atmosphere, which captures the frenetic energy of the World Fair era while maintaining a sense of impending doom. The work is widely recognized for its ability to balance character-driven drama with a broader critique of the political and moral climate of the time, making it a significant study of human behavior within a decaying system.