His family consists of his severe wife D. Lauriana, his angelic fair, blue-eyed daughter Cecília, his dandyish son D. Diogo and the "niece" Isabel, a cabocla who is in fact his illegitimate daughter by an Indian woman. Other people are also attached to his household, a few loyal servants, forty adventurers/mercenaries kept for protection, the young nobleman Álvaro de Sá, an appropriate suitor for his lawful daughter Cecília, and Peri, an Indian of the Guaraní people, who once saved Cecy’s life (as the romantic/romanticised Indian endearingly calls Cecília) and who has since deserted his tribe and family. Peri is the hero who gives title to the book, he is treated as a friend by D. Antônio and Ceci and as a nuisance by Mrs. Mariz and Isabel. The life of the characters is altered by the arrival of the adventurer Loredano (former friar Angelo di Lucca) who insinuates himself into the house and soon starts subverting the other vassals, planning to kidnap Cecília and scheming against the house of Mariz; along with the accidental murder of an Aimoré Indian woman by D. Diogo.