"Blyton, Enid" <br/><br/>
THE SECRET SEVEV (puzzle for the Secret seven) 

 - UK  Hodder & Stoughton,  1992 
 - 125 
<br/><br/><label>ISBN: </label>9780340569894 
<br/><br/><label>Dewey Class. No.: </label>F823  / 288