A woman discovers that her husband is having an affair with their nanny and that he is planning to divorce her. In a desperate attempt to save her marriage, she hires two men to stage a kidnapping of her son and to kill the nanny in the process. The plan, however, goes awry when the men mistakenly break into a neighbor's house and kill the wrong woman. Through a mix of frequencies in the baby monitors, the nanny is able to hear the men committing the crime and soon learns that she is their intended target. The men quickly realize their mistake and immediately go in pursuit of the nanny.