This is volume 11 in 39 Clues .

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

This book was published 2011 by Scholastic .

Peter Lerangis is the author of many books for young readers, including wtf , Smiler's Bones , the Watchers series, The Sword Thief , and the New York Times bestselling 39 Clues series. Peter lives with his wife and two sons in New York City. Visit him at PeterLerangis. com. Jude Watson is the author of two 39 Clues books, BEYOND THE GRAVE and IN TOO DEEP, and the bestselling Star Wars: Last of the Jedi and Jedi Quest series. As Judy Blundell, she wrote WHAT I SAW AND HOW I LIED, the 2008 winner of The National Book Award for Young People's Literature. She lives in Katonah, New York with her husband and daughter. Rick Riordan is the author of the hugely popular Percy Jackson series. Gordon Korman published his first book at age fourteen and since then has written more than ninety middle grade and teen novels. Favorites include the New York Times bestselling Ungifted, Supergifted, The Unteachables, Pop, Schooled, and the Masterminds series. Gordon lives with his family on Long Island, New York. You can visit him online at www. gordonkorman. com.