I liked "Hallowed" even more than "Unearthly". It was wonderful. This book was more focused on emotions, choices, feelings and personal growth. 
 It's hard to write about angels, because they always go with the God theme and so worldbuilding is tricky. Ms.Hand managed to build the world with angels, haven and God without any religious aspect of it. 
 The new plot developments were head-spinning. We get to know some shocking things about Clara's mom, dad, Jeffrey and Christian. 
 I am mostly fatalist. I believe that we have certain path in life that was determined before we were born by higher powers. But sometimes I think that it is easy way to live when you can blame all you problems on the destiny. I am conflicted. That's why I found the theme of purpose in this book so interesting. I like to read about Clara trying to decide if she should submit to the destiny or try to build her own road in life. 
 While in other YA books love triangle often makes girl to looks spoiled and with weak moral compass in "Hallowed" it makes Clara stronger, wiser and makes you respect her even more. Actually all participant of this love triangle are dealing with it with dignity. 
 That's official - Tucker is the best boyfriend in all YA genre. He is calm, reasonable, handles competition and jealousy very well. He isn't obsessive or controlling. He actually has life outside of Clara's life, so he is not just boy toy for the main heroine. 
 I didn't like Christian in the first book. But this time author showed me his good side and made me care for him too. But I still sense like something is off about him, that he has some hidden agenda. I guess we will see if I am right in a year or so. 
 I also love the way Ms.Hand makes fun of all YA genre cliches. It's very delicate irony that you can notice reading between the lines. 
 All in all it was great sequel and I think we should wait for the mighty finale.