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

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

This book was published 2014 by Scholastic .

Natalie Standiford is the author of HOW TO SAY GOOD-BYE IN ROBOT, CONFESSIONS OF THE SULLIVAN SISTERS, THE SECRET TREE, and THE BOY ON THE BRIDGE. She is originally from Maryland, but now lives in New York City and plays in the all-YA-author band Tiger Beat.