Magic Tree House (39 book series) by Mary Pope Osborne

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
• Magic Tree House Graphic Novels:  Jack and Annie’s original adventures come to life with full-color, vibrant art, perfect for graphic novel fans and reluctant readers
• 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