When Zoe takes an overnight babysitting assignment from a seemingly perfect family, the only worry she has is avoiding the unwelcome advances of teen brothers Tyler and Jack. Things go awry when Zoe suddenly finds herself in a bathroom groggy and confused with only the two youngest kids with her. While Tyler tries to explain how they got in there, an intruder attempts to break the door in. Soon Zoe discovers the "intruder" is Jack, who's had a psychotic break. The kids decide to wait out the night in the bathroom, as they expect their parents back in a few hours. When that help never arrives, they plot and attempt another escape, only to further anger Jack in the process. Zoe begins to realize that nothing is as it seems in this house, and that she isn't the first babysitter to learn this lesson.