Elena accidentally discovers that Thomas, her husband of ten years, has been having an affair with Monica. To get revenge on her unfaithful husband and the homewrecking mistress, she hides her true identity, takes a job as a high school substitute teacher, and deliberately draws close to Monica's son, Liam. Step by step, Elena uses every tactic at her disposal to make Liam fall hopelessly and utterly devoted to her. In the end, she not only completely thwarts Thomas’s plot to seize the family inheritance, but also makes Monica taste the searing pain of having her most beloved person taken from her — pulling off her carefully planned revenge.
