Although most of the books could be read without the others, it's probably better to have read them in order. Spoilers in this review and in the book itself will naturally occur if you haven't read the earlier books first. And since this book also entails the war that has been threatening since the first book, more than all the others, this book should be read last.
Cammon is the last and youngest of the six companions and it is right that his tale be told last. The six meet in the first book when two King's Riders, Tayse and Jason, and two Mystics, Senneth and Kirra--along with her man, Donal, are sent by the King to seek out rumors of unrest and treachery in the realm of Gillengaria, and rescue Cammon along the way. Cammon has always shown promise as a Reader--someone who can pick up strong emotions and some thoughts. He can sense those he cares for over great distances, and can see through shape-changing and illusions. As the book opens, he helps forestall several assassination attempts on King Baryn. When it is decided that Princess Amalie should receive suitors in order to help stabilize her claim to the throne, Cammon is called to the palace in order to help guard the King and the Princess and to help to secretly vet the suitors.
Cammon and Amalie had hit it off in an earlier book when she and step-mother Queen Valri needed guarding while making the rounds of the Houses of the kingdom. The fears of a number of perceptive people are realized when Cammon and Amalie grow closer and closer. Amalie needS to ally with one of the Twelves Houses, not alienate them by loving a commoner and a Mystic.
In the meantime, plots are coming to fruition. Halchon Gisseltess is in nearly open revolt--gathering forces for an onslaught against the King in the spring. His sister, Coralinda Gisseltess, continues to gather power as a Priestess who is out to destroy all Mystics. Other Houses are allies or may stay out of the fight. And disgruntled minor nobles of the Thirteenth House are fomenting rebellion in concert with Gisseltess's plans.
The first part of the book mostly concerns Cammon and Amalie. Both seem very young and somewhat naive--Cammon, particularly, since he naturally doesn't care about anything other than people: caring for the people he likes and keeping the bad ones away. He has little interest in training as a Rider or in society or status or politics, and it's not likely he will change. I would have liked to have seen a bit more development in all the characters, but in this series, they have remained very constant, despite what happens in their lives. (Tayse and maybe Senneth have possibly changed the most--and that, mostly in the first book.)
The action and battles in the last part of the book is exciting and suspenseful. There seemed to be a few unexplained inconsistencies (such as waiting to try a certain ploy when something like it might have been used earlier to greater effect, and powers that seem nearly omnipotent sometimes but not so useful at other times). There were a few things that were hinted at that didn't seem to come to any full effect--and some incredibly useful flaws in the enemy that were crucial (in almost an Evil Overlord sort of way)--plus an fairly easy out regarding the romance at the end, but then, perhaps that's just my own few quibbles and no one else would think of it that way. (I also wanted more about the raelynx, given that he's in the title, but oh, well.)
This book was still well-written and a satisfying conclusion to a good series.