This book is part of a book series called 39 Clues .

This book has been graded for interest at 8-12 years.

There are 4 pages in this book. This book was published 2009 by Scholastic .

Patrick Carman's previous books in the Land of Elyon series (The Dark Hills Divide, Beyond the Valley of Thorns, and The Tenth City) have all been New York Times bestsellers