Os Desclassificados (1972)

Berto is a young man who leads a quiet life, hoping to inherit the fortune of his millionaire father, Oswaldo. When he gets a new, beautiful young stepmother, Clara he falls in love with her. His incestuous love for her will cause a consequence: an assault by the troubled young man, which will result in tragedy. When his father travels for business, the two are alone and go out in the night for fun. On the way back, he plays a typical passionate game, they seem to be involved in each other, they end up enjoying the sleeping together. But she, however, has a lover, Oscar, manager of the bank where the family has a large account. He suffers from the relationship between his stepmother and Oscar and he plans a childish revenge stance by proposing to a group of bandit friends an assault to demoralize the adversary.