The Cahills are the most powerful family in the world, but the source of their power has been lost—scattered around the globe in the form of 39 Clues. The hunt for the Clues has begun and now is YOUR chance to shape history. But, beware—the Clues are in some of the most dangerous locations on earth, hidden by the most famous (and sneakiest) figures of the past 500 years. This Agent Handbook is your secret weapon-it contains all the information your rivals don't want you to know about the Cahills and the Clues. Just make sure it doesn't fall into enemy hands . . . This handbook has everything you need on the hunt: Get never-seen-before intel about the Cahill branches, including a whole section on the Madrigals! Discover insider information about key players. Track hidden branch strongholds on your own Agent Map. Protect your secrets with 18 pages of codes. Forge documents to confuse rival Clue hunters.