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 hotbed of Cahill activity for centuries. The clock is ticking for Amy and Dan.
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11 primary books12 released booksThe 39 Clues is a 12-book series with 11 primary works first released in 2008 with contributions by Rick Riordan, Gordon Korman, and 6 others.