Leira MacGregor is anxiously awaiting the arrival of two new families into her neighborhood. She is hoping desperately that someone will finally move in with children her own age. They may be able to help her solve the mystery of Grimly Manor.
The spooky manor, which was built long ago, has an ancient cemetery behind it. Accordingly, to whisperings, there is a scary man who lives there but no one has seen him except on Halloween. Candles flicker in the night and on holidays, decorations appear around the manor like magic.
Families in the neighborhood try and ignore these strange happenings. Over the years, children have only been to conquer their fear on Halloween by knocking on the decaying door. When the door was opened, they were "greeted" by someone in a frightful mask and costume and vicious growling in the background.