This is Book 1 in the Magic Tree House (R) Merlin Mission Series. See all Magic Tree House (R) Merlin Mission books here.
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Mary Pope Osborne is the author of over forty books for young people. She was the president of the Author's Guild, the leading organization for professional writers in the US, for two years and has won many awards for her books. She lives in New York with her husband, Will, and their dog, Bailey, who sleeps on top of Mary's desk every day while she writes.More about Mary Pope Osborne