Rhiannon Williams 
Ottilie Colter and the Withering World [EPUB ebook] 

SLEEPER COMES FOR NONEOttilie and her friends are members of the Narroway Hunt, a secret organisation that trains children to kill bloodthirsty monsters called dredretches.Now, the huntsmen are under attack by something far worse than dredretches. A witch is cursing them one by one, making them unwilling participants in a vengeful scheme. But what, exactly, is she planning and will Ottilie have to join her to find out?The thrilling conclusion to a much-loved trilogy about friendship, changing loyaltiesand never, ever giving up.