This book is part of a book series called Otto Undercover .

This book has been graded for interest at 9-12 years.

There are 128 pages in this book. This is a chapter book. Publishers market early chapter books at readers aged 6-10 years. This book was published 2006 by Turtleback Books .

Dan Santat is the Caldecott Award winning illustrator of The Adventures of Beekle . He lives in California.