Every family has its secrets.
In the world of The 39 Clues, the Cahill family is the most powerful in history and includes scores of famous people from Houdini to Benjamin Franklin. Right before she dies, Dan and Amy Cahill's grandmother, Grace, changes her will. Along with their other relatives, they can choose between a million dollars--and a clue. The source of the family power is lost, but there are 39 clues hidden all over the world that will reveal the family's secrets. Dan and Amy join the hunt, competing against other Cahills to solve the mystery and maybe save the world.
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