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A reasonably successful laborer named Juca (Arturo de Córdova) has come up with an idea for an invention that could very well make him wealthy, only to find that his supervisor has made off with the plans. Breaking the news to his wife, she kills herself out of despair, prompting Juca to vow revenge upon his now former boss. To this end, he dresses up as a beggar and takes to the streets, only to find that his success as a beggar threatens to make him very wealthy. While working the streets, he meets a prostitute and the two quickly enter into an sexual relationship. Juca's new lover soon meets and falls in love with a young man who turns out to be the son of Juca's former boss. Learning of the relationship, and, more importantly, the extent that his prostitute friend loves the young man, Juca revokes his vow of revenge so that the young woman can try and have a happy life.