The 39 Clues #4: Book 4: Beyond the Grave
The breakneck hunt for clues leads Amy and Dan to a mysterious ancient city that has been a hotbed of Cahill activity for centuries. All that stands between them and the Clue is a cryptic riddle, a missing relic, and a hidden secret from their grandmother’s past. But their ruthless relatives are close by, and will stop at nothing to eliminate them from the competition. The clock is ticking for Amy and Dan. Can they really solve a mystery that has eluded their ancestors for generations?
Crack the code to reveal the secret message.