I found Rivers of London by chance years ago in the English books section of Hamburg main station's book store. I did like the descriptive plot. But I can't find it on my book shelves any more - must have given it to someone for reading and didn't get it back. Pity, I'd like read it again some time.

And thanks for this thread - didn't know that this novel was just the first one in a long series.   Maybe I'll need a new bookcase; the old ones are filled with the complete (as far as I know) Terry Pratchett, Dorothy Sayers and Tony Hillerman, amongst others.