3.5 stars 
 An inspired retelling of the snow queen. The beginning is quite slow and did drag a bit, but once the magical components were expanded I really wanted to know what would happen next. 
 What I liked 
 - Thyra is scrupulous and determined enough that she will do whatever needs to be done to obtain her goal. She really does have a heart made of ice, badass heroine to the core! 
 - She is not a damsel, her life is in her own hands. 
 - The story line flows well and I was invested in the plot. Will she fix the mirror in time? If she does, what then? Voss isn't exactly trustworthy.. 
 - Thyra is crazy smart. And Kai appreciates her intelligence. 
 - Magic had it's limits and could not solve everything. 
 - A lot of emphasis gets placed on the importance of education and that the desire to learn is admirable 
 - (view spoiler)[I also liked that the metaphorical ice surrounding her heart was not because she was a bad person who suddenly becomes good - this can be annoying - but is carefully explained by her parents death, a horrible foster mother and the fact that she has been isolated for years with no company and the prospect of a doomed fate hanging over her head. The subsequent thaw of this metaphorical ice was super slow, it took months after Kai got there for her to even be friendly and I also think that a great deal of the thaw was due to Luki, the most adorable wolf companion. (hide spoiler)] 
 What I didn't like so much was the writing style, although I can't exactly explain why. It just didn't really flow that well for me and it did make me take a bit longer to finish this book than I would have otherwise. 
 The ending was somewhat unexpected, and I liked it because of that! It was definitely an ending that I had to respect, and it made me admire Thyra all the more for it.