The #1 bestselling Magic Tree House series is ready to whisk you away across the world with Jack and Annie--this time to save a sea turtle!It's just a regular day when ordinary kids Jack and Annie are whisked away in the magic tree house to the Galapagos islands, where they must save a sea turtle from an erupting volcano! But what do Jack and Annie know about saving a sea turtle?! Plenty, thanks to some magic that makes them experts. A helicopter ride, rushing lava, and a whole lot of determination make this one adventure Jack and Annie will never forget! 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 booksMerlin Missions: More challenging adventures for the experienced readerFact Trackers: Nonfiction companions to your favorite Magic Tree House adventuresGraphic Novels: Relive the original adventures brought to life with art by Kelly & Nichole MatthewsIf you're looking for Merlin Mission #38: Monday with a Mad Genius, it was renumbered as Merlin Mission #10 when the series was rebranded in 2017.