Pan's realm

"Are there such things as fairies and gnomes? Leprechauns and elves? Most people, including Adam, would say no. But one day a whole herd of magical creatures invades Spooksville. At first they play childish pranks, and Adam and his friends are happy to welcome them. But quickly the pranks turn cruel, leaving Adam, Sally, Watch, and Cindy fighting for their lives"--Amazon.com.