The #1   bestselling chapter book series of all time celebrates 25 years with new   covers and a new, easy-to-use numbering system!
 The magic tree house has returned and it’s taking Jack and Annie back in   time to Alaska, 1925. There they meet Balto, a jet-black Siberian husky   destined to save victims of the diphtheria epidemic. But the trail isn’t   easy, and Balto is going to need Jack and Annie’s help!
Formerly numbered as Magic Tree House #54, the title of this book is now Magic Tree House Merlin Mission #26: Balto of the Blue Dawn.
 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
 Have more fun with Jack and Annie at MagicTreeHouse.com!