Blyton , Enid  <br/><br/>
The mystery of the invisible thief :  

 - Egmont :   London ;  1950. 
 - 227 p; 21 cm .  01 
 - 2025-06-02 
<br/><br/><label>ISBN: </label>9780603569696 
<br/><br/><label>Nat. Bib. No.: </label>0011300 
<br/><br/><label>Nat. Bib. Agency Control No.: </label>BLY 
<br/><br/><label>Universal Decimal Class. No.: </label>823