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A Clue found in Book 3 sends Amy and Dan jetting off to find out just what´s behind the fierce rivalry between the Tomas and Ekaterina branches of the Cahill family. Was a Clue stolen from the Tomas branch? Where is it now? And most important, can Amy and Dan get their hands on it before their rivals do?

Amy and Dan are hot on the trail of the fourth Clue, but their ruthless relatives will stop at nothing to eliminate them from the competition. Their hunt leads them to an ancient city that has been a hot bed of Cahill activity for centuries.

It´s a wild race that will take Amy and Dan deep into the bowels of the earth . . . and right into the hands of the enemy.