For all the Iron Fey series, this is the only one which I nearly gave three of stars. I enjoyed the beginning, but not in the middle. It was boring. I nearly abandoned it. Puck wasn't as funny as before, and for a couple times, I felt Ash's out of character. He's talking too much for an Ash. Is it because of the narration? May be. Too girly for an Ash, IMO. 
 In testing ground part. Not saying I hate it, but it made me not being able to help myself questioning. What's the reason Ash attracted to Meghan or Ariella? Their weakness? The druid's granddaughter was weak also. And I don't understand how Ariella manage to survive. The explanation about Faery brought her back isn't enough for me. So she could die in order to give Ash and Meghan happily ever after? (view spoiler)[TOO MAKSAAA! >_< (hide spoiler)] 
 Above all, I love the world. Completely different from the previous three, though reminded me to a certain zombie movie with Alice inside :D 
 Also love the testing part. I can feel his emotion and his transformation from fey to human. More than the Happily Ever After Ending. Guess, I don't care if Ash become purely mortal who can age. That's why I can't help myself not giving this book below 3 stars. (it's 3,5 actually. --> 4) 
 Anyway, Anyhow, I'm waiting for Kagawa's next book. XD