The 39 Clues

I'm currently reading a GREAT series called The 39 Clues. A boy named Dan Cahill and his sister Amy find out that they are part of the most powerful family in the world. There grandmother Grace gives them a choice: 1,000,000 dollars or go on a hunt for 39 clues. When all the clues are found, the person who found them will be the most powerful person in the world. Will Dan and Amy win? Read the books to find out!