If you've been reading the Throne of Glass series, then you're probably hooked and don't need this review. Heir of Fire is the third in the series if you don't count the prequel, The Assassin's Blade.
When book three begins, Celaena is in Wendlyn looking for a way to get to Doranelle to see Maeve and get some answers. She is captured and then accompanied by Rowan, a delicious Fae character who has sworn a blood oath to Maeve. The book then jumps to Chaol and Crown Prince Dorian in Adarlan where there are some interesting developments and the arrival of some new and important characters, and then a chapter later jumps to an Ironwitch named Manon Blackbeak, heir to the Blackbeak WitchClan. It is the chapters describing the meeting and competition of the witch clans, Blackbeak, Blueblood and Yellowlegs where they select and train their wyverns that I found most engaging. The book then alternately advances the plot for each of the three settings.
Since this is not a trilogy, all is not nicely tied up at the end. I can tell you, without revealing too too much, that skillfully woven into book three is a nice surprise pulled on a powerful opponent, a heartbreaking death, and a dire enslavement that left me shaking my head and screaming "Noooooo!" My only wish is that the next book in the series was available right now.