Dan and Amy Cahill make the decision to take the first clue and begin the hunt for the 39 clues around the world to discover the source of their family's power. When their beloved aunt--matriarch of the world's most powerful family--dies, orphaned siblings Amy and Dan Cahill compete with less honorable Cahill descendants in a race around the world to find cryptic clues to a mysterious fortune. Includes game cards which the reader may use to play an online version of the treasure hunt.