Christie , Agatha  <br/><br/>
They do it with mirrors : 

 - Collins :   London ;  1952. 
 - 122 p ; 21 cm .  01 
 - 2025-06-03 
<br/><br/><label>ISBN: </label>9780007451678 
<br/><br/><label>Nat. Bib. No.: </label>0011283 
<br/><br/><label>Nat. Bib. Agency Control No.: </label>CHR 
<br/><br/><label>Universal Decimal Class. No.: </label>823