When Matt's single mother is unable to take any more time off of work, she hires a new nanny on the fly to watch over Matt and his younger sister, Judy. Miss Swan, however, is all too happy to have them over. And although she seems like the perfect babysitter, letting the kids eat whatever they want and mostly leaving them alone, there's something about her that Matt doesn't trust. He thinks she may actually be the witch from local legend—the one who torments children into the night and then eats them. Is he just having a hard time dealing with Ruby's replacement, as his friends suspect? Has he watched one too many scary movies, as his mom fears? Or are he and his horror-buff friends in for the fright of their lives as they come face-to-face with a real monster?