This book is by far the best and most amazing threequel (yes, that is a word) I have ever read. I honestly cannot find words to describe how perfect this novel is, so I will attempt to say what this novel isn't.
Heir of Fire is not a resolution or ending. It is not a continuation or simply another step in the chain of events. It is not a quest story. It is not a teen fantasy story. It is not a romantic love triangle story. And it is not the story of Celaena, or Chaol, or Dorian.
Heir of Fire is the story of Adarlan and Wendlyn and Terrasen and Ellwye, and it is the story who Celaena was and what she will become to these countries and people.
If this description seems overly vague or confusing, please know that this is intentional. Only by reading this series will you understand how truly phenomenal and revolutionary these books are. Please take time out of your busy life to read them.