This is volume 15 in Magic Tree House Fact Tracker .

This is a chapter book. Publishers market early chapter books at readers aged 6-10 years. This book was published by Random House Books for Young Readers .

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.