The narrator frames the narrative as a defense for a deliberate transgressive act, offering a retrospective confession that traces origins in a strictly bourgeois upbringing. He recounts family dynamics, competing parental influences, and the effects of successive tutors, including a charismatic priest, which awaken a cerebral duality and an obsession with purity versus hypocrisy. The book follows his intellectual and emotional formation, the development of an uncompromising will, and the rationalizations that lead him to commit what he sees as a salvific crime. Themes include social hypocrisy, moral absolutism, gendered power tensions, and the psychology of transgression.