I went back to this thread to post something and, with no small amount of surprise, found out that I was the one who posted here last, because apparently no one else reads anything (it's a joke, don't get offended, please).
I've just reread one series of Polish fantasy books that I've read a few years ago because a new volume came out in the meantime that I didn't get the chance to read until now and I thought I'd refresh my memories of the previous books as well. It turns out that it is, in fact, better than I remembered. It tells the story of a new recruit in a secret unit of vampires within the Polish Internal Security Agency and includes themes like blind obedience, divided loyalties and sacrificing lives to a cause. It's a pretty good read overall. And why am I telling you this? Because I found out that the first three books (which are the ones I've originally read, and form a self-contained story on their own) have actually been released in English under the titles of Nighter (I don't like the translation of this one, btw, but whatever), Renegade and Nobody (apparently there's also a compilation volume titled Vesper). So if you'd like to check out some Polish fantasy, they may not be the best of the best, but at least they're available without learning another language just for this purpose, so...
A warning, though: the series is about vampires, so there's a lot of blood in it and a couple of sex scenes as well. It's also Polish, so there's a realistic (read: significant) amount of swearing. If you're strongly averse to any of those things, these books are not for you. Otherwise, well, go ahead.
For those of you who may be interested, the author's name is Magdalena Kozak, and you will need it because searching for "nighter" in Google doesn't give any relevant results. Trust me, I tried.
EDIT: I've read the official English description of the first book. It's a bit misleading, but it does get across the gist of what is generally going on in the series: there are good vampires and bad vampires, and the main character joins the former to fight the latter. And then it turns out not everything is as black-and-white as it seems...