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 myst...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. Book includes game cards which the reader May use to play an online version of the treasure hunt.