Minutes before she died Grace Cahill changed her will, leaving her descendants an impossible decision: "You have a choice - one million dollars or a clue." Grac

A guide to the characters and situations in "The 39 Clues" outlines the Cahills' secrets, including hidden facts, strategies, agents, lost founders, secret base

International bestseller David Baldacci pens the stunning conclusion to Cahills vs. Vespers! It started with a kidnapping. A shadowy organization known only as