This is volume 17 in Magic Tree House Fact Tracker .

This book has been graded for interest at 7-9 years.

There are 121 pages in this book. This is a chapter book. Publishers market early chapter books at readers aged 6-10 years. This book was published 2008 by Perfection Learning .

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.