Redmond Barry, a minor Irish gentleman, attempts to ascend the social hierarchy of 18th-century Europe through a series of opportunistic and often unscrupulous maneuvers. Driven by an insatiable desire for status and wealth, Barry navigates the volatile landscapes of military service, professional gambling, and aristocratic marriage. His progress is hindered by his own arrogance and lack of moral foresight, which eventually lead to his inevitable downfall. The narrative is presented as a first-person memoir, characterized by the protagonist's unreliable and self-serving perspective on his own life events.

Readers and critics frequently discuss the effectiveness of Thackeray's use of an unreliable narrator to satirize the vanity of the protagonist. Discussion often centers on the stark contrast between Barry's self-aggrandizing tone and the actual moral bankruptcy of his actions. Many highlight the sharp, biting wit that permeates the text, noting how it serves to expose the superficiality of the era's aristocracy. The pacing is often described as deliberate, reflecting the episodic nature of a life defined by constant movement and shifting fortunes. Readers generally appreciate the book for its cynical humor and its unflinching look at the consequences of unchecked ambition.