Dom Casmurro is a classic story of love and jealousy. It tells the story of Bento and his childhood love, Capitu, who overcome their parents' reluctance to marry. However, Bento jealously suspects that their son is not his.

But beyond this straightforward plot, Machado de Assis plays with the reader's expectations and comments on the structure of the story, blurring the line between fiction and reality. This approach makes Dom Casmurro appear very modern and unique among its contemporaries.