The #1 bestselling Magic Tree House series is ready to whisk you away through time with Jack and Annie--this time to the Yosemite National Park! The magic tree house whisks Jack and Annie to the Yosemite National Park in 1903. They are surprised to join John Muir and President Theodore Roosevelt on the most significant camping trip in conservation history! Did you know that there's a Magic Tree House book for every kid? Magic Tree House: Perfect for readers who are just beginning chapter books Merlin Missions: More challenging adventures for the experienced reader Fact Trackers: Nonfiction companions to your favorite Magic Tree House adventures If you're looking for Merlin Mission #35: Night of the New Magicians , it was renumbered as part of the rebrand in 2017 as Merlin Mission #7.