The Black Book of Buried Secrets - 39 Clues - Rick Riordan

The Black Book of Buried Secrets
The 39 Clues
Rick Riordan
Scholastic
ISBN 9780545285049

This book is different from any of the other books in the 39 Clues Series I have read. It is almost a handbook or manual on the 5 branches of the Cahill family. It is also the only book that is not available as an eBook out of all the books across the three series. That being said, it is a beautiful book, every page is glossy full color.

The book, as mentioned, has a section for each of the 5 branches of the family. Each section has a history of the founder, current members, key past members, and profiles of some active agents. It is a wonderful companion book and gives a lot of background information on people, places and events key to the clue hunt, current and historical. It is also a good pivot piece between the original 39 Clues series and the second Cahills VS. Vespers. Of all the books and series I have read, I am amazed at how much this one has kept my attention across the original series and the Rapid Fire short series. And I eagerly look forward to reading the second series. I just wish it was available in eBook for quick search and reference while reading the other books.
 
The 39 Clues:
The Maze of Bones - Book 1 - Rick Riordan
One False Note - Book 2 - Gordon Korman
The Sword Thief - Book 3 - Peter Lerangis
Beyond the Grave - Book 4 - Jude Watson
The Black Circle - Book 5 - Patrick Carman
In Too Deep - Book 6 - Jude Watson 
The Viper's Nest - Book 7 - Peter Lerangis
The Emperor's Code - Book 8 - Gordon Korman
Storm Warning - Book 9 - Linda Sue Park
 Into the Gauntlet - Book 10 - Margaret Peterson Haddix
The Black Book of Buried Secrets - Rick Riordan
Vespers Rising - Book 12 - Rick Riordan

Card Pack #1 - Books 1-3
Card Pack #2 - Books 4-6
Card Pack #3 - Books 7-9
Rare Card Pack

The 39 Clues Cahills vs. Vespers
The Medusa Plot - Book 1 - Gordon Korman
A King's Ransom - Book 2 - Jude Watson
The Dead of Night - Book 3 - Peter Lerangis
? - Book 4 - Roland Smith
? - Book 5 - Linda Sue Park
? - Book 6 - David Baldacci

The 39 Clues Rapid Fire:
Legacy - Book 1 - Clifford Riley
Ignition - Book 2 - Clifford Riley
Hunted - Book 3 - Clifford Riley
Crushed - Book 4 - Clifford Riley
Turbulence - Book 5 - Clifford Riley
Invasion - Book 6 - Clifford Riley
Fireworks - Book 7 - Clifford Riley