What is a short summary of the 39 clue the maze of bones chapter 1-20?

Dan and Amy Cahill are orphaned siblings whose grandmother has passed away. In her will, she leaves her relatives a "clue". The Cahills are the world's most powerful family and the secret to their power is hidden around the world in the form of 39 clues. In The Maze of Bones, Dan and Amy learn about what being a Cahill really means and begin their hunt for the clues. Along the way, the meet new relatives, and experience many adventures that almost take their lives.