The Maze of Bones by Rick Riordan
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 and begin the search? At the reading of their grandmother's will, Dan and Amy are given this choice - and they take the clue. Immediately, they are caught in a dangerous race against their own family members. The hunt is on...Think you've gone everywhere books can take you? Think again. Books are going to a new place, but you have to follow the clues to get there. Join Amy and Dan as they begin the hunt for the 39 Clues in Book One: The Maze of Bones. The high-octane adventures will continue for a total of ten exhilarating books written by well-known authors over two years. The 39 Clues also encompasses hundreds of game cards and an online world that that allows you to play a part in the story and compete for 100s of prizes, totalling over 50,000 pounds.