Enid Blyton <br/><br/>
The Mystery Of The Spiteful Letters 

<br/><br/> An adventure for the Five Find-Outers and their dog. Fatty, Larry, Daisy, Pip, Bets and Buster become involved in a very peculiar situation when a series of unsigned letters are sent to various people in Peterswood. 
<br/><br/><label>ISBN: </label>9781405203968 
<br/><br/><label>Dewey Class. No.: </label>English BLY