The intrepid Jack and Annie are summoned once again to the fantasy realm of Camelot. There, Merlin the Magician tells them that the Stone of Destiny has been stolen. The answer to its disappearance lies within a haunted castle. With a young magician named Teddy, Jack and Annie take on the challenge in an adventure that takes them to new heights and places they couldn't even imagine!

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.Sal Murdocca has been illustrating and writing books for children for many years. He has illustrated every book in the Magic Tree House fiction series and the Magic Tree House Research Guide nonfiction companions. Sal and his wife Nancy are avid runners and have toured Europe on bicycles. He lives in Rockland County, NY.