Amy and Dan Cahill discover at their grandmother's funeral that they belong to a strong and powerful family. They give up two million dollars to compete in a contest to find the thirty-nine clues. They travel around the world to solve mysteries that will hopefully lead them to the thirty-nine clues that will uncover a powerful secret. But they are not alone. Their cousins, uncles, and relatives try to kill them in their own quest to find the thirty-nine clues.
