Sage, Angie <br/><br/>
Darke / 
Angie Sage ; illustrated by Mark Zug. 
 - New York :  Harper Collins,  c2011. 
 - 279 p. : ill. ; 18 cm. 
 - Septimus Heap ; bk. 6 .
<br/><br/><label>ISBN: </label>9780061242434