A well conceived (and titled) collection of middle-of-the-road, mildly chilling short stories, almost all of which involve a modern day boy or girl’s encounter with a supernatural entity in an old ghost town. In “Buried,” an adolescent girl traveling with her parents is able to help a little-girl ghost psychologically so that she can rest in peace. Two runaway boys encounter several ghosts in “The Intruders,” whose scary presence teaches them that they are too young to be on their own. “Payback,” which reads like a contemporary fairy tale, tells the story of a boy’s reward for coming to the defense of a downtrodden ghost dog. The most engaging story in the book is “Trade-Off,” in which a ghost protagonist gets the opportunity to switch places with a live boy and join a real human family. The majority of the stories are gently instructive in that they teach an ethical lesson or have some kind of moral dimension. Additionally, the format gives Nixon the opportunity to painlessly slip in a little historical data about the various ghost towns. Each story is followed by a succinct history of the ghost town it is set in, directions for getting there and other information for children who want to explore the topic more deeply, including books and selected Web sites. Although the bulk of the stories are conventional and competent rather than weirdly thrilling, Nixon has put together a clever package for youngsters interested in ghosts and ghost towns. (Short stories. 8-12)