"The bestselling series returns with an even deadlier challenge, as a new enemy is revealed to be searching for The 39 Clues too...Amy and Dan's race to save the hostages continues. Where will it lead them next? More titles available: CAHILLS VS VESPERS 1: THE MEDUSA PLOT (9780545298391), CAHILLS VS VESPERS 2: A KING'S RANSOM (9780545298407) and CAHILLS VS VESPERS 3: THE DEAD OF NIGHT (9780545298414)."