Carman, Patrick. <br/><br/>
The black circle / 
Patrick Carman. 
 - Library ed. 
 - New York :  Scholastic,  2009. 
 - 168 p. :  ill. ;  20 cm. 
 - 39 clues ;  bk. 5 .
 - 39 clues ;  bk. 5. .
<br/><br/> Wilson's Junior High School, October 2010  Horn Book, April 2010 
<br/><br/> Siblings Amy and Dan Cahill continue their global search for the clues that will unlock the Cahill family's secret power while also working to evade Irina Spasky. 
<br/><br/> 4.4.  3-6  Follett School Solutions. 
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<br/><br/><label>ISBN: </label>0545090636 
<br/><br/><label>LCCN: </label>2009921984 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Family--History--Fiction.<br/>Cryptography--Fiction.<br/>Genealogy--Fiction.<br/>Mystery fiction.
<br/><br/><label>Index Terms--Genre/Form: </label><br/>Code and cipher stories.<br/>Mystery fiction.
<br/><br/><label>Dewey Class. No.: </label>[Fic]