This is volume 20 in Magic Tree House Fact Tracker .

This book has been graded for interest at 7-9 years. This book is part of a reading scheme, meaning that it is a book aimed at children who are learning to read.

There are 117 pages in this book. This is a chapter book. Publishers market early chapter books at readers aged 6-10 years. This book was published 2009 by Turtleback Books .

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.