A melancholy Dom Casmurro, who writes a book to tell his vision of his own story and also to restore, in old age, the moments lived in adolescence alongside the great love of his life, Capitu, a girl who seduced him with her "hangover eyes".
In this adaptation of the work by Machado de Assis, Bentinho promises his mother he will become a priest but follows a different path: he marries Capitu. Years later, a doubt consumes him—did she cheat on him with Escobar?