The 39 Clues, Book 1: The Maze of Bones by Rick Riordan
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What would happen if you discovered that your family was one of the most powerful in human history? What if you were told that the source of the family’s power was hidden around the world, in the form of 39 Clues? What if you were given a choice – take a million dollars and walk away…or get the first Clue? If you’re Amy and Dan Cahill, you take the Clue – and begin a very dangerous race.