"Amy and Dan Cahill believed that their grandmother betrayed them. Couldn't she have mentioned their family's wild history? Didn't she think they had a right to know about the 39 Clues? But while Grace is dead, she is not forgotten. And she left a few hints behind to help her grandchildren on the hazardous hunt for the 39 Clues. Including a copy of her guidebook to Egypt, with some VERY interesting "extras." What do the crossed out-letters mean? What was Grace trying to say?"