The legendary life of Mexican singer Lucha Reyes is the basis of this fictionalized biography ( or as director Arturo Ripstein puts it "an imaginary biography"). Lucha Reyes was an unconventional, and sexually liberated woman, most famous for her "cancion ranchera" style singing. Her story begins in 1939, where at 33 she still lived at home with her mother, Dona Victora, the madame of a renowned Mexico City whorehouse. Lucha marries the liberal Pedro Calderon and then buys a beggar's daughter. She becomes the mother to this child, Luzma. Lucha craves lasting love like junkies crave heroin. But for her loyal daughter, she never finds it and in the end no one can help her.

A rumor reaches a small town, San Garabato, that a government infiltrator will arrive to check the conditions of the community. Quickly, the municipal president, Don Perpetuo del Rosal, orders the imprisonment of those who might give a bad image. An indigenous man named Calzonzin arrives in town, pursued by two men. He is quickly taken as the infiltrated inspector, and protected by all the local authorities.

A group of students arrives in a small town during a hiking expedition. Once there, the local priest accuses them of being communist agitators on the run from an army crack-down against student demonstrations in nearby Mexico City and rallies the townsfolk to lynch them. Based on a true story.