Trick or treat! It's Halloween in Coolsville, and Scooby and the gang are getting into the holiday spirit by dressing up for a big costume party. But first they must follow mysterious clues that lead them to a haunted old mansion where ghosts, goblins, and ghoulies abound. This isn't a Halloween party -- it's a monster mash! Will the gang make ever make it to their party? It's up to the reader to help the kids escape the haunted house using the stickers inside this book. Over 40 stickers are included.