Blyton, Enid.  <br/><br/>
The famous five: five have a mystery to solve :    vol 20 /  
Enid Blyton.  
 - London :   Hodder headline limited,   c1988.  
 - 195 p. ;   18 cm.  
<br/><br/><label>ISBN: </label>9780340894736 0340894733 
<br/><br/><label>Subjects--Index Terms: </label>A letter of george.  A mystery.  A surprising signal.  
<br/><br/><label>Dewey Class. No.: </label>808.83  / BLY