I just finished this book today, and I came away very impressed. It's one of those books that brings back the action I like to see in fantasy. There were action scenes galore, and the author still found the time to develop interesting characters. It's a fun book, but it can also be a bit dark at times. Contrary to so much that's out there, I found it had grittiness without overdoing it.
The big thing is that our heroes are actually heroic, especially the protagonist. That's not to say he doesn't have his flaws. He does. But they're not the kind of flaws that make him a terrible person. To be honest, I'm sick of seeing so much fantasy starring despicable protagonists. At times, it feels as if authors don't know how to make a well-rounded character who still falls on the hero side of the spectrum. I'm glad Sebastien de Castell didn't go that route, providing me with characters I liked going through an action-packed story.
If you're looking for an exciting story that finds a balance between today's Grimdark and the optimistic fantasy of old, this is a good book to take a chance on.