The Maze of Bones — Rick Riordan

FIND THE 39 CLUES
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.