This fantastic companion book of the bestselling The 39 Clues series includes: Bios of the branch leadership Interviews with the branch's top agents The location of the branch's clues The complete branch history The branch's preferred codes Maps of the branch strongholds Security protocols (the branch's spycraft) | The Black Book of Buried Secrets (The 39 Clues) by Rick Riordan, Hardcover | Indigo Chapters