The Secret Seven  
Secret Seven 
 -  106 p. ; 18 cm ; pbk. 
 - London  Hodder Children's Books  2015 
<br/><br/><label>ISBN: </label>9780340893074 
<br/><br/><label>Dewey Class. No.: </label>823.912 BLY  / 22.823.912 BLY