15The #1 bestselling chapter book series of all time celebrates 25 years with new covers and a new, easy-to-use numbering system!Wildfire! That's what Jack and Annie are up against when they are whisked away to the land of Australia. And they're not alone! Jack and Annie must help a baby kangaroo and a koala escape from a fire-filled forest. Will they be able to rescue the animals in time?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 booksMerlin Missions: More challenging adventures for the experienced readerSuper Edition: A longer and more dangerous adventureFact Trackers: Nonfiction companions to your favorite Magic Tree House adventures