This is book 4 in 39 Clues-Cahills Vs. Vespers .

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

This book was published 2012 by Scholastic .

Roland Smith is the best-selling author of Peak, The Edge, and other critically acclaimed adventure novels for young readers. When he isn't writing, he's traveling the country, speaking at schools and events. He lives in Portland, Oregon. www. rolandsmith. com