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Shaken by a shocking loss, Amy and Dan flee to an exotic land and trace the footsteps of their most formidable ancestor yet: a military leader of mythic proportions. But just as the siblings begin to master the art of ancient warfare, they confront a dangerous enemy - the truth. With the stakes higher than ever, Amy and Da uncover a devastating secret about the Cahill family that changes everything.
About The 39 Clues
The 39 Clues™ is a groundbreaking, multi-media adventure series that combines reading, online gaming, and card collecting. Launched internationally in the United States, United Kingdom, Australia, New Zealand, and Canada on September 9, 2008, this interactive series for ages 8-14 will span 10 adrenaline-charged books, collectible game cards, and an online game on www.the39clues.com that allows readers to play a part in the story and compete for prizes.