For the past five hundred years, the Cahills have silently dominated the world. Their desperate hunt for the 39 Clues lies behind some of history’s biggest enigmas – the curse of the Hope diamond, the race to summit Mt. Everest, the wild life and death of Harry Houdini. And now – finally – the secrets are out. With an introduction by Rick Riordan, The 39 Clues: The Black Book of Buried Secrets reveals the shocking truth about history’s most notorious family. In full, lush color, The 39 Clues: The Black Book of Buried Secrets lays bare each hidden fact, concealed strategy, top agent, lost founder, secret base and hushed-up scandal of the Clue hunt. This complete guide to the Cahills contains information on all five branches, including the notoriously elusive Madrigals. The must-know information includes: - Full files on the enigmatic Man in Black. - The true purpose of the Madrigal branch. - The complete story of the fire that split the original Cahill family. - The truth about the night Hope and Arthur Cahill died. - Open access to the secrets of the Lucian, Ekaterina, Tomas and Janus branches. It’s never too late to join the hunt – especially with The 39 Clues: The Black Book of Buried Secrets to provide complete access to the Cahill’s most deeply-buried secrets.