Biography of the brother and sister duo Celly and Tony Campello, famous singers in Brazil during the sixties, mainly for creating localized versions of international rock 'n roll hits.

An wealthy Italian immigrant from São Paulo, watches closely the suitors of his daughter Fiametta, whose two previous husbands "suffered accidents" because they did not bear good children. She can only get pregnant of someone who, like her, bears the blood of the rare K factor.