Scholastic 39 Clues: Cahills Vs Vespers: Card Pack 1: The Marco Pou

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The Cahills were the most powerful family history had ever known . . . until they met the Vespers. Now the fight is on and the world hangs in the balance. 16 explosive evidence cards unlock a globe-trotting online mission. Follow the ancient trail of explorer Marco Polo and the warlord Kublai Khan to stop a Vesper plot ? and discover their darkest secrets.