The explosive finale to Scholastic's mega-selling series.
Amy and Dan Cahill face their greatest challenge on their quest to find the thirty-nine clues, but in order to discover the secrets of their lineage they will have to make a choice that could impact the world's future.
She effortlessly shook off their grip and raised herself into a crouch. She reached for the gun and the remote. “That's my serum!” Isabel raged. She had the gun in her hands and was aiming it at everyone fighting over the vial.
Amy and Dan Cahill learn an ultimate truth that reveals the Madrigal Mission's importance and the danger that their nefarious family members pose to the entire world.
Throughout the hunt for the 39 Clues, Amy and Dan Cahill have uncovered history's greatest mysteries and their family's deadliest secrets.