The Iron Knight by Julie Kagawa is the 4th full-length book in the Iron Fey Series. It is the story of Ash, and his journey to becoming mortal for Meghan.
Here is the summary from Goodreads:
Ash, former prince of the Winter Court, gave up everything. His title, his home, even his vow of loyalty. All for a girl… and all for nothing.
Unless he can earn a soul.
To cold, emotionless faery prince Ash, love was a weakness for mortals and fools. His own love had died a horrible death, killing any gentler feelings the Winter prince might have had. Or so he thought.
Then Meghan Chase—a half human, half fey slip of a girl— smashed through his barricades, binding him to her irrevocably with his oath to be her knight. And when all of Faery nearly fell to the Iron fey, she severed their bond to save his life. Meghan is now the Iron Queen, ruler of a realm where no Winter or Summer fey can survive.
With the (unwelcome) company of his archrival, Summer Court prankster Puck, and the infuriating cait sith Grimalkin, Ash begins a journey he is bound to see through to its end— a quest to find a way to honor his solemn vow to stand by Meghan’s side.
To survive in the Iron realm, Ash must have a soul and a mortal body. But the tests he must face to earn these things are impossible. At least, no one has ever passed to tell the tale.
And then Ash learns something that changes everything. A truth that turns reality upside down, challenges his darkest beliefs and shows him that, sometimes, it takes more than courage to make the ultimate sacrifice.
I have to be honest, this was not my favorite book in the series, and that happens in a series sometimes. I overall thought the series was ok, but I wasn't gung-ho over it like many other bloggers.
I think that because it was mainly about Ash, it was just more cold. It lacked, for me, the warmth and humor that the other books in the series had (especially the novellas).
I also felt the ending was rushed. Yes, the journey was very important, but I felt like we wasted all our time getting to the challenges and then BOOM challenges met and problems solved, the end.
If I taught high school, I'd have this on my shelves, but only because it completed the series. If it were a stand alone book, probably not, unless a student specifically asked me to get it. I really hate saying that, but you just sometimes can't love every book.