Bestselling author Jude Watson takes Amy and Dan on a thrill-packed ride for the 4th installment of the 39 Clues.JOIN ANYTIME TO PLAY FOR THE CHANCE TO WIN!A Clue found in Book 3 sends Amy and Dan jetting off to find out just what's behind the fierce rivalry between the Tomas and Ekaterina branches of the Cahill family. Was a Clue stolen from the Tomas branch? Where is it now? And most important, can Amy and Dan get their hands on it before their rivals do?It's a wild race that will take Amy and Dan deep into the bowels of the earth . . . and right into the hands of the enemy.

Bestselling author Jude Watson takes Amy and Dan on a thrill-packed ride for the 4th installment of the 39 Clues.JOIN ANYTIME TO PLAY FOR THE CHANCE TO WIN!A Clue found in Book 3 sends Amy and Dan jetting off to find out just what's behind the fierce rivalry between the Tomas and Ekaterina branches of the Cahill family. Was a Clue stolen from the Tomas branch? Where is it now? And most important, can Amy and Dan get their hands on it before their rivals do?It's a wild race that will take Amy and Dan deep into the bowels of the earth . . . and right into the hands of the enemy. 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.