Carman, Patrick. <br/><br/>
The black circle  
Patrick Carman. 
 - New York :  Scholastic,  2009. 
 - 168 p. :  ill. ;  20 cm. 
 - The 39 clues ;  bk. 5 .
<br/><br/> Where are Amy and Dan Cahill? The two kids were last seen in Egypt, hunting for one of the 39 Clues that could make them the most powerful people on earth. But no one has seen the siblings since. Has the ruthless Irina Spasky finally tracked them down? Or worse ... the Madrigals? 
<br/><br/><label>ISBN: </label>9780545090636 0545090636 9780545060455 (hbk.) 0545060451 (hbk.) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Brothers and sisters--Juvenile fiction.<br/>Orphans--Juvenile fiction.
<br/><br/><label>Subjects--Geographic Terms: </label><br/>Russia--Juvenile fiction.
<br/><br/><label>Index Terms--Genre/Form: </label><br/>Mystery fiction.<br/>Adventure fiction.