Minutes before she died Grace Cahill changed her will, leaving her decendants an impossible decision: "You have a choice - one million dollars or a clue."
Grace is the last matriarch of the Cahills, the world's most powerful family. Everyone from Napoleon to Houdini is related to the Cahills, yet the source of the family power is lost. 39 clues hidden around the world will reveal the family's secret, but no one has been able to assemble them. Now the clues race is on, and young Amy and Dan must decide what's important: hunting clues or uncovering what REALLY happened to their parents.
Rick Riordan is the #1 New York Times bestselling author of the Percy Jackson and the Olympians series for children and the Tres Navarre series for adults. His books have won many accolades including a mention on the 2005 New York Times Notable list for The Lightning Thief. Rick lives with his family in San Antonio, Texas.