enid blyton <br/><br/>
"Well Done, Secret Seven (Secret Seven #3)" 

 - London  Hodder & Stoughton  1952 
 - 189 p. ; 20 cm. 
<br/><br/><label>ISBN: </label>0 340412895 
<br/><br/><label>Dewey Class. No.: </label>BLY