39 Clues: Cahills vs. Vespers6 books in series
39 Clues: Cahills vs. Vespers Publisher's Summary
Amy and Dan find themselves in a new global race but this time, everything’s different. Those closest to them might be working for the enemy, and Amy and Dan are forced to ask themselves how far they’re willing to go to save the kidnapped Cahills. How much can you risk when there’s no one to trust?