Riordan, Rick, The Maze of Bones, 182 pages, published 2008, Sexual Content: G, Language: G, Violence: G. One day Dan and Amy Cahill's grandma dies and there grandma leaves them a secret message about there family. They are part of the most powerful family in the world! They give up two million dollars in exchange for one clue. They are put in a dangerous race against other powerful Cahill family members who will do anything to win the most powerful prize in the world. I really enjoyed this exiting and mysterious book. I never wanted to put it down. EL- ESSENTIAL. Student Reviewer: SO.