Kass, Mallory. <br/><br/>
The black book of buried secrets  
[written by Mallory Kass] ; introduction by Rick Riordan. 
 - Library ed. 
 - New York :  Scholastic,  2010. 
 - [188] p. :  ill. ;  20 cm. 
 - The 39 clues ;  bk. 12 .
 - 39 clues ;  bk. 12. .
<br/><br/> "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. 
<br/><br/><label>ISBN: </label>9780545309622 054530962X 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Brothers and sisters--Juvenile fiction.<br/>Orphans--Juvenile fiction.<br/>Inheritance and succession--Juvenile fiction.<br/>Adventure stories.<br/>Code and cipher stories.
<br/><br/><label>Dewey Class. No.: </label>[Fic]