In the beginning of the Twentieth Century, in Belo Horizonte, the industrial Sampaio lives in a manor house with his stepdaughter Carmen, who has a sort of engagement with Roberto. Sampaio's daughter Neusa, of same age as Carmen, was sent to a metropolis to have a modern education and returns to Belo Horizonte. In the São João party in the country of Acaba-Mundo, promoted by the traditional Marta, Neusa has a one night stand with Roberto. Carmen witnesses their affair and decides to commit suicide. Meanwhile, Cristovão and his cousin Max decides to go to a cabaret in town instead of staying in the party,. They find Carmen and bring her to Marta's property, where she stays with the family and Tufy, Max's younger brother. Along this period, Cristovão falls in love for Carmen, and she has to decide between the love of the unfaithful Roberto and Cristovão.