She was hired to watch over the kids. But who was going to watch over her.
Growing up on the poorer side of town, 18 year old Michelle Winston (Keri Russell) not only apperciates the opportunity to make some money babysitting for the wealthy, upwardly mobile Bertrands, but takes pleasure in being surrounded by the material trappings of their home. Bill (Stephen Collins) and Sallie Bertrand were a young successful couple who seemed to live a happy, typical existence. But that storybook tale comes to a tragic end when Sallie is found dead in her home, the victim of an apparent suicide.
Feeling an obligation to- and sympathy for- Bill and the two children, Michelle becomes more and more a fixture in the Bertrand home. But as she begins to spend virtually all of her free time there, and is seen driving Sallie's new car and wearing her old jewelry, she quickly alienates her mother and all her school friends with her new found responsibilities.
This sudden transformation is also looked upon suspiciously by the police. When the circumstances surrounding Sallie's death are re-examined, Michelle soon finds herself the prime suspect in her death.
Michelle's friends, jealous of her all-consuming relationship with the Bertrands, suspect there's something unpleasant happening between her and the supposedly grieving widower. Their suspicions prove fairly accurate as Bill does make advances toward the impressionable schoolgirl. But his intentions are not based on love, but to set up his attractive babysitter for the murder of his wife.