Driven by an insatiable curiosity for forbidden magic, the protagonist Lucius inadvertently transforms himself into an ass, initiating a series of chaotic and humiliating encounters. Lucius navigates a world populated by thieves, priests, and sorcerers while trapped in his animal form. His primary objective is to regain his human identity, a goal that requires him to endure physical hardship and social degradation. The narrative employs a first-person perspective, blending satirical observation with philosophical reflection as the protagonist moves through the Roman landscape. The story operates under the logical constraints of ancient magical realism, where divine intervention and human folly intersect.

Readers and scholars frequently analyze the text as a foundational example of the picaresque novel, noting its unique position as the only complete Latin novel to survive from antiquity. Discussion often centers on the abrupt tonal shift between the ribald, comedic adventures of the first ten books and the deeply religious, mystical conclusion involving the goddess Isis. Critics highlight the author's ability to maintain a fast-paced, episodic structure that keeps the reader engaged through a variety of bizarre and often grotesque scenarios. Many readers appreciate the text for its historical insight into the social and religious atmosphere of the Roman Empire. The work remains a subject of intense academic interest due to its complex blend of satire, folklore, and spiritual autobiography.