Paul S Kemp dedicated this book to R E Howard, Fritz Leiber, Leigh Brackett and Michael Moorcock, and for a modern take on classic sword & sorcery of those authors, you wont find better. If you like any of those writers, you'll like this. If you like Joe Abercrombie, you'll like this (although this is more fun as not quite as dark). Its most clearly a homage to Fafhrd and the Gray Mouser, for all they usually appeared in short story rather than novel format, but if they had been in a novel, it would have been like this.
Egil (the big one) and Nix (the small one with a smart mouth) are an infamous pair of tomb-robbing adventurers, who now only wish to retire and own a pub in their home town of Dur Fallin. Both fortunately and unfortunately, they killed a demon on their last job: fortunately because killing a demon is better than being eaten alive, and unfortunately because someone powerful had plans for that demon, and now its up to Egil and Nix to fix that little problem, willingly or not. That may all sound a little standard for the genre, but its more than that - such as a character that manages to turn from someone whose untimely, gruesome death I was looking forward to into a character just all too human: dumb and proud, not evil and bound for a shallow grave.
This book just pulses with adventure, witty dialogue, and nasty things that go chomp in the night. There are geases, demons, evil sorcerers, debased humans, whores, damsels in distress and long-dead corpses which may or may not animate. I can't praise this book enough; its like it was specifically written to appeal to "fun stuff I love".
If you like sword and sorcery, dark fantasy, or anything like that, you should give this book a try.