The disaffected wife of a failed civil servant, is thrilled to re-encounter Octavio, a former lover who is now a union activist on the run from a corrupt politician. Hoping to help him, she descends into the Mexican underworld, where she finds a purpose-and a thrill-missing from her married life.

In mid-nineteenth century Guanajuato, the beauty and charm of the young heiress Amalia conquers the lowly foreman Ricardo with fatal results. Prevented from consummating their love, Ricardo is going to Guanajuato where again later become the rich owner of a mine. On his return, fate has prepared a tragic encounter with Amalia.

A young journalist asks an old artist about the portrait of a naked Indian woman that he has in his study. The artist tells the story of Maria Candelaria, a young Indian woman who was rejected by her own people for being the daughter of a prostitute. She is protected by a young Indian man, Lorenzo Rafael, who has fallen in love with her.