MARY POPE OSBORNE is the author of the New York Times #1 bestselling Magic Tree House series as well as coauthor of the Magic Tree House Fact Tracker series, along with her husband, Will; her sister, Natalie Pope Boyce; and her good friend Jenny Laird.
AG FORD is a New York Times bestselling children's book illustrator and recipient of two NAACP Image Awards. He grew up in Dallas with his mom, his dad, and his two sisters and one brother. He majored in illustration at Columbus College of Art & Design and now lives with his family in Frisco, Texas. Visit him at agfordillustration.com.

The #1 bestselling Magic Tree House series is ready to whisk you away across the world with Jack and Annie--this time as World Turtle Experts!
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 giant tortoise from an erupting volcano! But what do Jack and Annie know about saving turtles?! 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 books
Merlin Missions: More challenging adventures for the experienced reader
Fact Trackers: Nonfiction companions to your favorite Magic Tree House adventures
Graphic Novels: Relive the original adventures brought to life with art by Kelly & Nichole Matthews
If 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.