All in all a good read, if you like that sort of thing. I saw many reviewers calling it the female version of Supernatural, and I couldn't agree more. There is the more reckless sister that embraced the life of the demon hunter, and the younger one that wanted out, to pursue a more 'regular' life but personal matters draw her back into the old ways. Each chapter is like a new episode bringing a new monster/demon. 
 For me lacking a bit of a romance, or something personal apart from the sisterly bond.