In 19th century Brazil, young people in the State of São Paulo fight against black slavery and the farmers who support it. Against this backdrop, Sinhá Moça falls in love with a young lawyer, and they get involved in a great love story.

"The Mystery of the Black Domino" was the first film directed in Brazil by a woman, the pioneer Cleo de Verberena. Marcos and Virgílio are medical students and share the same room. At the end of the first night of carnaval, Marcos finds the corpse of a woman, dressed as a black domino, inside the closet and accuses Virgílio of murder. Virgílio defends himself by saying that that was Cleo, wife of Commander Fernando Almeida, and that he found her in the corso asking for help, but Marcos questions Virgílio about the veracity of the story. Lost Film.

Isaura, a white slave, is constantly harassed by Leôncio, a landlord and her owner by inheritance. However, she refuses to give in to his desires and escape.

After running away from home and going to the big city, Eufêmia, a young girl, meets a scoundrel, who pretends to be good to her and gets her a job in a cabaret.