MARY POPE OSBORNE is the author of many novels, picture books, story collections, nonfiction books, and chapter books-including all of the Magic Tree House books, which have been translated into numerous languages around the world. She works with her husband, Will, and her sister, Natalie, on the nonfiction companion series, Magic Tree House Research Guides. Mary lives in Connecticut with Will and their three Norfolk terriers, Joey, Mr. Bezo, and Little Bear. For more information, visit MaryPopeOsborne.com.
SAL MURDOCCA has illustrated over 200 children's trade and textbooks. He is also a librettist for a children's opera, a video artist, an avid runner, hiker, and bicyclist, and a teacher of children's illustration at the Parsons School of Design. He has illustrated all of the Magic Tree House books and all of the Magic Tree House Research Guides. Sal and his wife split their time between New York and France.

The #1 bestselling chapter book series of all time celebrates 25 years with new covers and a new, easy-to-use numbering system!
Jack and Annie are off on another mythical mission at the request of Merlin the magician. Luckily, they have a young sorcerer, Teddy, to help them. From underwater caves to a Spider Queen, from mystical selkies to a magical sword, this is a Magic Tree House adventure kids won't want to miss!
Formerly numbered as Magic Tree House #31, the title of this book is now Magic Tree House Merlin Mission #3: Summer of the Sea Serpent.
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
Have more fun with Jack and Annie at MagicTreeHouse.com!