This is volume 12 in Magic Tree House Fact Tracker .

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

This book was published 2012 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.