Vespers rising /  Rick Riordan, ...[et.al].   

 - NY :  Scholastic Inc,  c2011. 
 - 238p 
 -  The 39 clues; bk11  .
<br/><br/><label>ISBN: </label>9780545290593   
<br/><br/><label>Dewey Class. No.: </label>FIC R479ve 2011