Based on the infamous song by the same name "La Negra Tomasa". This is a comical adventure based in a barrio in Mexico. César Bono plays a police office, Alfonso Zayas a ladies' man and Roberto Ballesteros a dangerous loan shark who abducts Tomasa out of passion.
Three interlocking anecdotes about boy/girl stuff. Two gigolos make a bet to see which can boff an heiress first, a young artist tries to persuade his upper-class parents that his artist's-model fiance is a good choice for marriage, and a guy on the run from the mafia hides from them by cross-dressing.
Diana secretly owns a nightclub and has a son named Arturo. When Arturo gets his college degree, he decides to celebrate and goes to the nightclub he does not know his mother owns. There, he meets and falls in love with a lady of the night. When he takes her home to meet his mother, both women are embarrassed. Diana offers the girl money to leave Arturo alone, and the young girl takes it and gives it to Arturo with a letter saying she’s leaving. Arturo is upset with his mother and drifts away from her. Diana, tired of the nightclub business and of the double life she has led, decides to retire and gives the nightclub to the women who have worked for her. She intends to patch things up with her son and to welcome the woman that Arturo has chosen to marry.
