A suburban family chooses seemingly sweet Peyton Flanders as their newborn's nanny. Only much later does the infant's mother, Claire Bartel, realize Peyton's true intentions -- to destroy Claire and replace her in the family. The nail-biting suspense builds quickly in this chilling psychological thriller about deception and bitter revenge. After her sex offender husband gets caught in the act and kills himself, an embittered pregnant widow loses her child, and embarks on a mission of vengeance against one of her husband's victims and the woman's family.