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.