Blyton, Enid <br/><br/>
Secret seven adventure 

 - London  Hodder Children's  2002 
 - 121 
 - The Secret Seven .
<br/><br/> A priceless pearl necklace has been stolen, and the Secret Seven witnessed the thief making his escape. But where has he hidden the necklace? 
<br/><br/><label>ISBN: </label>9780340796375 
<br/><br/><label>Dewey Class. No.: </label>823  / BLY-S