This is one of the most original fantasy / SF books I've ever read. It's a creative mix of a lot of different ideas and unlike other books where the combination doesn't work, in this series it all clicks together perfectly.
The second book in the trilogy, it is an exciting fantasy western with demon-driven technology. There are people with swords, six shooters, demon powered steamboats and ships, plus lots of influences that have been inspired by real world cultures. The names of places and people are almost modern, but slightly off centre, making them both familiar and easy to read.
The fantasy elements come in the form of the non-human races, elves and dwarves but they are nothing like what you are imagining. One of the two main characters is Shoe, a half-dwarf, but don't expect someone who sings, drinks a lot and is a miner. Shoe is an old soul and about a couple of hundred years old, a man of two worlds who doesn't really fit into either, he's also a bounty hunter of sorts and together with his partner Fisk, they get caught up in the middle of a war that they inadvertently started in the previous volume.
This book is packed full of ideas and the cultures of each nation are distinct and somewhat familiar because they are a reflection of our world. World building is definitely a strength of Jacobs, and so are his characters. Everyone is realistically human and flawed, even the heroes. You can like a character one moment and then hate them in the next chapter for being selfish, only for them to redeem themselves a little later on. The characters breathe and flow, growing and changing.
Overall this is such a wonderfully creative and different book to 99% of the other SF and fantasy I read. Definitely worth reading and I can't wait to read the final volume.