The #1 bestselling chapter book series of all time celebrates 25 years with new covers and a new, easy-to-use numbering system! Who wants to vacation next to a volcano? Jack and Annie are about to find out when the Magic Tree House whisks them back to the days of the Roman Empire. They arrive in Pompeii and soon discover that it is the very day the city will be destroyed. Now Jack and Annie must race against time to find an ancient library before it is buried in ash! Did you know that there’s a Magic Tree House book for every kid? Magic Tree House: Adventures with Jack and Annie, perfect for readers who are just beginning chapter books Merlin Missions: More challenging adventures for the experienced reader Super Edition: A longer and more dangerous adventure Fact Trackers: Nonfiction companions to your favorite Magic Tree House adventures