"Amy and Dan Cahill's lives changed forever when they were given the choice between a million dollars and the first of the 39 Clues, the key to their family's mysterious power. After traveling the world for the Clue hunt, they built a state-of-the-art command center where they train Cahill agents, monitor their enemies, and make sure the candy room stays well stocked. You can't save the world on an empty stomach."