Rating: 3.5/5 
 ***Minor spoilers, spoilers for book 1 & 2*** 
 I went into this book expecting something greater and more awesome than Crown of Midnight. I hoped that this would be one of those series that got better as it went on. For some people, it still is that series. But to me, this was my least favourite in the series so far. We're taken from fast paced bad-assery to something much, much, MUCH slower. 
 Heir of Fire begins with Celaena's farewell to her friends in Adarlan as she sets off to Wendlyn on the king's orders to kill the royal family. As always, Celaena has her own schedule, of course. She's wandering the streets when she's approached by a Fae male who orders her to come with her. He brings her to Celaena's aunt Maeve, who promises to answer Celaena's questions about the keys once she trains to control her magic. Back in Adarlan, Chaol struggles with what to do with the knowledge of who Celaena really is, and Dorian is trying to learn more about his strange magic. 
 The most disappointing thing to me about this book was how dull I found the first chunk. I only really started getting into it maybe 80% into the book. For that first portion, I expected to rate this a 2.5 or 3, but the ending redeemed it for me a bit. We spend the majority of this book following Celaena as she attempts to master her power of fire. This book took a huge turn from the last book - we went from assassins and schemes to Fae and magic. It was a turn I didn't enjoy that much, and I didn't go in expecting something like this. 
 I loved Celaena's character in the previous two books. She was ruthless, she took what she wanted, and she was a nightmare with a weapon. It was just so different in this book. I wanted the badass assassin from the second book, but instead I got a girl who spent most of the book getting beaten onto her ass. I wanted that ruthlessness and devotion that she had in the previous books, but it just wasn't there, and it just wasn't the same without Celaena being with Chaol and Dorian. 
 I found the amount of different perspectives here to be overwhelming. When I wanted to hear more about Celaena or another POV, the perspective would change the next chapter. I couldn't understand why I was supposed to care about some of the other POVs. In all, I think there were at least 6 perspectives and I found it quite annoying how it would switch between them. 
 The thing that redeemed this book to me was, as I mentioned, the ending. I didn't think it was a SPECTACULAR ending, but it left me wanting to read the next book, at least. The ending left off seeming to me like Celaena would go back to being the character she was in the previous books, and that was a huge relief. I may have considered stopping here if she didn't change. 
 Overall, the book was still good but I found it disappointing in comparison to the rest of the series. I felt like it was mostly filler but the ending was good. If you've finished Crown of Midnight I would still recommend reading this one, because I feel like the next book will be better.