Enid Blyton <br/><br/>
The Find-Outers:The Mystery of the Spiteful Letters 

 - London  Hodder Children's Books  2016 
 - 189 
<br/><br/><label>ISBN: </label>978-1-4449-5519-7 
<br/><br/><label>Dewey Class. No.: </label>823  / BLY