The #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 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