Beautiful high-school student Allie, a former track star waiting tables at her single mom Beth's restaurant, is having a thrilling secret affair with handsome, much-older Justin. However, Allie doesn't know that her new boyfriend is a cheating husband, married to Sabrina: a perfectionist suburban housewife willing to go to extremes to keep her marriage intact. When Sabrina finds out that Justin has been cheating on her, the betrayed wife decides to take matters into her own hands, bent on revenge. But there is no such thing as a foolproof plan. What happens if the already volatile situation spins out of control?