This was a really great read, with imaginative settings, well-rounded, interesting characters and exciting ideas. I think the Iron-Fey existence itself is what separates this book from all the others in this genre. The concept is fresh and well-reasoned, and this is what made the book for me. I can't say enough about how good the world, storyline and writing was. 
 And criticisms? Well only small ones. I thought that the second half of the book was much stronger than the first half. This is mainly due to less action and Meghan being a bit dim in the first part of the book. Sometimes I just wanted to shake her. Ash had literally just told her about showing emotion and how in the Winter Court, it is a weakness. Read: don't show it! What does she do? Complain about Ash being cold, callous and "one of the monsters", completely missing why he would act like that. And then she cries about it. In fact she cries quite a lot throughout the book. 
 Also, it's, if not stated, implied that the technology (which is basically fuel for iron-fey) is not imaginative, artistic or whatever but there is a lot of creativity in technology. Just saying. 
 These did stop me from giving it 5 stars but they are only small and the book was still very good. The covers were very pretty as well. I will be looking forward to the next book! :)