A Marca da Ferradura (1971)

Drama based in true events. In rural area in the state of São Paulo, mean and powerful Coronel Firmino kills his wife and blind Jeremias, who he thinks was his wife's lover. when he learns his daughter is blind and believes she is the blind man's child, not his own. Famous singing duo Tonico & TInoco (themselves) go to the village and proceed to unveil the truth.