The lifelong rivalry between twin brothers Pedro and Paulo, mirroring the political divisions of 19th-century Brazil, threatens to destroy their family and the social circles they inhabit.

Set against the backdrop of the transition from the Brazilian Empire to the Republic, the narrative follows the twins from their birth to their eventual estrangement. Their mother, Natividade, attempts to reconcile their opposing temperaments and political allegiances, but the brothers remain locked in a cycle of competition for affection, status, and influence. The story is presented through a self-conscious, ironic narrator who frequently addresses the reader, complicating the reliability of the account. The brothers' conflict serves as a microcosm for the broader national struggle between monarchists and republicans, highlighting the absurdity of ideological rigidity.

Readers and critics frequently highlight the novel's biting wit and the sophisticated, detached tone of its narrator. Discussion often centers on how the author uses the twins' petty squabbles to critique the volatile political climate of post-colonial Brazil. Many observers note that the book functions as a complex psychological study rather than a straightforward historical account. The balance between intimate character development and broader social commentary is often cited as a hallmark of the author's mature style. Readers appreciate the intellectual challenge posed by the narrative structure, which demands active engagement with the text's ironies.