Kass, Mallory. <br/><br/>
The black book of buried secrets / 
[written by Mallory Kass] ; introduction by Rick Riordan. 
 - New York :  Scholastic,  2010. 
 - 184 p. :  ill. (mostly col.), ports. ;  20 cm. 
 - 39 clues .
 - The 39 clues .
<br/><br/> Presents a guide to the characters and situations in "The 39 Clues" and outlines the Cahill's secrets, including hidden facts, strategies, agents, lost founders, secret bases, and scandals, as well as information about all branches of the family. 
<br/><br/> 3-7.  8-12.  6.7. 
<br/><br/>
<br/><br/><label>ISBN: </label>9780545285049 0545285046 
<br/><br/><label>LCCN: </label>2010929046 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Secrecy--Fiction.<br/>Ciphers--Fiction.
<br/><br/><label>Dewey Class. No.: </label>Fic