Blyton , Enid  <br/><br/>
The rat- a- tat mystery : 

 - Armada :  London ;  1951. 
 - 155 p ; 21cm .  01 
 - 2024-07-16 
<br/><br/><label>ISBN: </label>0006915639 
<br/><br/><label>Nat. Bib. No.: </label>0009859 
<br/><br/><label>Nat. Bib. Agency Control No.: </label>BLY 
<br/><br/><label>Universal Decimal Class. No.: </label>823