Bruce, Mark, and Charles have long been the school bullies, tormenting younger and weaker kids. But they go too far the day they try to make their fellow student, Johnny, enter the dreaded crawl space under the school cafeteria's stage. Everyone knows the crawl space is haunted by a boy who entered it and never returned, and Johnny is terrified. But fortunately, the school principal catches the boys before it's too late. As punishment, she offers them the choice of notes to their parents or spending the weekend cleaning out the crawl space. More scared of their parents than the rumor of a ghost, they choose the latter.
But once they are alone in the school, the boys discover that not only is the crawl space haunted, but so is the rest of the school. When the ghost gives the boys a riddle to solve, they must make many difficult choices to ensure their survival. However, the reader gets to participate in making these choices, which range from which hallway to go down to which key to use to open a mysterious box. Whether the boys survive their punishment is as much the reader's responsibility as it is that of the boys' themselves, but just as the boys can't control the supernatural events happening to them, even the reader won't be able to control the storyline completely.