Rick Riordan's newest mystery centers around the Cahills - the most powerful family the world has ever known. The source of its power is a mystery that can only be unraveled by assembling 39 clues that have been hidden around the world throughout history. Follow the Cahills as they find the 39 clues, and play the game online.
General Note
Unabridged.
Compact discs.
"Exclusive bonus material, secret surveillance tapes of Grace Cahill!"--Container cover.
"Listen to the audio, play the game, win the prizes"--Container cover.