Quick warning: English is not my mother language, so please take it into account when reading this review!
The action of Fire Caste is located on a jungle planet called Phaedra, where a bitter conflict between Tau and Astra Militarum has been going on forever there, with no side able to wipe the other out. The Arkan Confederates are the latest regiment to be deployed there, and are sure that their faith in the Emperor will give them the win... or will it?
I've read this book two times now, it was my first contact with Peter Fehervari's Dark Coil (his books and short stories have various links between each other which makes it very fun to read as you, the reader, try and connect the dots between the various characters, places and events), and Fire Caste still remains my favorite.
A simple way to describe Fire Caste is "Apocalypse Now meets the Warhammer 40k universe" and it works, but fortunately it doesn't stop there. Peter Fehervari's style is "enriching" (as in, it made me learn a lot of new, beautiful English words!) and it always sticks to what it is about. For instance, when he describes the planet, Phaedra, where the action takes place, he chooses visceral words to give the reader the feeling he is confronted to a living organism, as the planet is kind of the main antagonist of the various characters.
About the characters, this is another very strong point of the novel, as they are all treated equally. Each character has dreams, beliefs and reasons to do what he does. And the author doesn't telegraph at all who is going to live and who is going to die, so you're sometimes caught off guard when a major character is killed, sometimes "offscreen", or when a minor character suddenly gains more weight and turns out to be a major player.
Another thing I enjoy is that his characters are not simply "bad" or "good". It's not because a character is depicted in a "negative" light that he will be painted in one stroke. For instance, one of the officers of the story is depicted as being detached from his men, not remembering their names and so on. With a "classic" author, this would automatically mean that the officer is incompetent and will get his men killed. Not in Fire Caste, it's more complicated than that.
I've also enjoyed the fact that, at the end, after seeing all the reasons of the various characters, the author does not tell us "this one is right and the others were wrong". It is up to the reader to determine who he/she felt was right and who was (probably) wrong.
Another strong point are the action scenes: they are very well written, tense and sometimes very stressful. And I had always pictured sentinels as kind of ridiculous and clunky. After reading action scenes with them in this novel, not anymore!
Anyway, reading the novel a second time after having read the other novels/short stories of Peter Fehervari made Fire Caste even more enjoyable. The first time I read it, I felt kind of let down by the end because I still had so many questions and the end is pretty nihilistic. By reading it again, I find the end very fitting and enjoyed the novel even more.
Also when reading, keep an eye out for references as the author loves to hide easter eggs to the things he love here and there. As a big "John Carpenter's The Thing" fan, I was delighted to find references to it for instance. :)
I don't think everybody will enjoy this novel, though. It's a very dark take on an already dark universe. But if you're tired of heroic stories in this universe, you should definitely give it a try, as Peter Fehervari's mature approach to 40k shows that this universe can be much, much more than just repetitive battle scenes with unflinching heroes.