This is book 1 in 39 Clues .

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

This book was published 2015 by Scholastic .

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.