Watson, Jude. <br/><br/>
The 39 clues :  Beyond the grave / 
Jude Watson 
 - New York :  Scholastic Ltd.,  c2012 
 - 190 pages ;  20 cm. 
<br/><br/> Amy and Dan are hot on the trail of the fourth Clue, but their ruthless relatives will stop at nothing to eliminate them from the competition. Their hunt leads them to an ancient city that has been a hotbed of Cahill activity for centuries. The clock is ticking for Amy and Dan. 
<br/><br/><label>ISBN: </label>9781407135632 
<br/><br/><label>Subjects--Topical Terms: </label><br/>GAMES -- FICTION
<br/><br/><label>LC Class. No.: </label>FIC .W32 2012