Minutes before she died Grace Cahill changed her will, leaving her decendants an impossible decision: "You have a choice - one million dollars or a clue." Cahills are the most powerful family in the world. Everyone from Napoleon to Houdini is related to the Cahills, yet the source of the family power is lost. 39 clues hidden around the world will reveal the family's secret, but no one has been able to assemble them. Now the clue race is on, and young Amy and Dan must decide what's important: hunting clues or uncovering what REALLY happened to their parents.