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Shop nowDark Day in the Deep Sea
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Learn moreThe #1 bestselling chapter book series of all time celebrates 25 years with new covers and a new, easy-to-use numbering system!
The magic tree house leads Jack and Annie to a tiny deserted island in the middle of the ocean. The brother and sister team are soon rescued by a ship of explorers and scientists who are looking for…a sea monster!
Formerly numbered as Magic Tree House #39, the title of this book is now Magic Tree House Merlin Mission #11: Dark Day in the Deep Sea.
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
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
Mary Pope Osborne is the author of all the Magic Tree House books, as well as American Tall Tales and New York’s Bravest for Knopf. The author lives in Goshen, CT.
Mary Pope Osborne is the author of all the Magic Tree House books, as well as American Tall Tales and New York’s Bravest for Knopf. The author lives in Goshen, CT.