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

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

There are 4 pages in this book. This book was published 2014 by Scholastic US .

Jeff Hirsch is the bestselling author of The Eleventh Plague and The Darkest Path. He lives in Beacon, New York. www. jeff-hirsch. com