Riley, Clifford. <br/><br/>
Spymasters (The 39 Clues: The Cahill Files). 

 - 256  p. 
<br/><br/> Spymasters (The 39 Clues: The Cahill Files) by Clifford Riley (2013) 
<br/><br/><label>ISBN: </label>9780545564687