Toña decides to live with her boyfriend Pepe, but her mother and sister do not agree and make her distrust her partner, to the point that she thinks he is unfaithful and both will be separated by hazards of fate.

Gerardo brings his mother's ashes to meet "the crazy woman" of the famous song of 'En el muelle de San Blas'. After thinking that she was dead, he finds Doña Berenice, who tells her story.