The books are about the adventures of siblings Amy and Dan Cahill. They agree to a challenge in their grandmother Grace Cahill's will and search for 39 clues scattered around the world. The books are designed to teach history, using real historical people in the series as part of the Cahill family.
Win It: TWO lucky readers will win autographed copies of both The 39 Clues Book 1: The Maze Of Bones and The 39 Clues Book 2: One False Note!
Enter at My 4 Monkeys by March 29th!