Wow. That was a one fascinating book. I have bitten all my nails reading it. Richelle Mead surely knows how to create a gripping plot. 
 Basically we can divide this book in two parts. In the first part Eugenie try to end the war and find Iron Crown for that purpose. And this was very exciting adventure. We finally get to see Eugenies' true affection toward Dorian, not just lust and curiosity like in previous two books. Also there still are a lot of lust thing going on. 
 But it is the second part that made this book so great. I can't say what happened, because it will be spoiler but it was one major U turn in the plot. And what I liked the most is that these events allowed us to see characters differently. Put everything in perspective. 
 I love Eugenie. I think that she is a great character who is smart and capable. But in this book some of her decisions just pissed me of! She keeps making the same mistakes again and again. And she is a little slutty. She continues to run from one man to another even if she sees that they both have huge flaws. I wanted to shake her. Eugenie, just pick one already! 
 Now let's talk about male characters. I always have been in love with Dorian and disliked Kiyo. Well, I still feel the same, only now I think that Dorian don't deserved to be with Eugenie (or she with him for that matter). Oh, and now my dislike to Kiyo grew into rage and disdain. I understand his reaction to the events in book, but he could handle it better and with some delicacy and tact. Who knew he would be such an ass. 
 There is one small thing I don't understand. It is a little detail, but it bugged me. Eugenie keeps talking about how she enjoys Dorian control and dominance in their sex live. And this is going from the rape victim. In previous book she couldn't tolerate even a small touch from any man, and now suddenly she is all for dominance game? Seems kind of unrealistic to me. 
 In conclusion, if you liked the first two books you will definitely enjoy this one too. Richelle Mead knows just right recipe for a good book - a spoon of action, a pint of cool world building, a cup of complicated romance, a pinch of humor. Mix it up and bake for some time and you will have one great book ready! 
 Spoilers!!!! Do not read below if you don't want to know what happened. 
 I have written this right after I read the scene. As the book progressed I calmed down a little, but I still want to express my feelings about this. 
 That slut!!!!! How could she do this to Dorian?! I love Eugenie, but I totally hate her for sleeping with Kiyo. Okay, I admit that I am being a hypocrite here. When in second book she slept with Dorian right after breaking up with Kiyo I was all for that. But that was understandable! Who wouldn't choose gorgeous cunning king over boring vet? But her sleeping with Kiyo without even trying to settle things with Dorian first was low and mean.