This book is 'good enough;' at least, that's what it is for me as an adult reader. The writing is nothing remarkable and the romance is cliche. The concept and plot are engaging albeit imperfect: there are several holes in the logic (example: angel can heal from life-threatening wounds in a couple of days, but blisters pose a problem), which I just sort of chose to disregard, and a few rather convenient coincidences to explain characters' behaviors and abilities. I was more impressed by several other young adult fantasy novels ("Daughter of Smoke and Bone," Ship Breaker," "Shadow and Bone," and even "Divergent"); however, the story in this one is suspenseful enough that I plan to read the sequel.