In this book there was a funeral and the Cahill family went there. There was a choice of getting $1,000,000 or getting a clue to find the most precious thing in the family. Then, there were two children who chose the clue and they worked together to find the other clues to the thing. Later, they teamed up with two relatives to find the thing and then one of the relatives betrayed them. The team was in tough situations, but they found a way to get out of the situation. In the end they found the thing in the last book.