Ignatius J. Reilly, a self-styled philosopher and misanthrope, finds his comfortable existence in New Orleans disrupted when his mother forces him to seek employment. Ignatius navigates a series of absurd professional failures, each escalating into chaos as he attempts to impose his rigid, medieval worldview upon the modern world. Opposed by his mother, his persistent girlfriend Myrna Minkoff, and the general incompetence of the working class, Ignatius remains trapped by his own intellectual arrogance and physical inertia. The narrative utilizes a third-person perspective to document his descent into various social environments, highlighting the friction between his grandiose delusions and the mundane reality of 1960s New Orleans.

Readers frequently highlight the singular voice of Ignatius J. Reilly as the primary draw of the work, noting his ability to be simultaneously repulsive and compelling. Discussion often centers on the author's precise command of dialect and the meticulous construction of the New Orleans setting. Critics observe that the pacing relies heavily on the escalating absurdity of the protagonist's interactions with a colorful supporting cast. The balance between slapstick physical comedy and dense philosophical critique remains a frequent point of analysis for those examining the book's enduring status. Many readers find the work's cynical humor to be a sharp commentary on the disconnect between intellectual theory and practical living.