La madrastra

During a trip to Spain, Marcia Cisneros is accused of murdering Nicolás Escalante and is sentenced to 35 years in prison. Esteban Lombardo, her husband, considers her not only a murderer but an adulteress who killed her lover to cover up her betrayal, so he abandons her and files for divorce. Marcia is certain that she is innocent and that among her ex-husband's friends is the murderer, so she studies law while in prison to reopen her case.

Twenty years later, a lawyer manages to get her early release and she returns to Mexico to clear her name and be reunited with her children, but they believe her dead. Lucrecia, Esteban's older sister, placed a portrait of an unknown woman in their home and the children grew up adoring the woman in the portrait. Marcia summons all the suspects, who are shocked to see her, but to win over her children and investigate each of the suspects, she changes her name and introduces herself as Marisa Jones. Marcia forces Esteban to break up with his fiancée in order to marry her, thus becoming the stepmother to her own children