Just been looking at my book collection and found a couple of novels that might be of interest:
The first is called Ratcatcher by James McGee, the second is its sequel, Ressurectionist (haven't read this on yet, but thought the first was a good yarn).
It's set in London, I think it's during the Napoleonic Wars, can't quite remember. The main character is a bow street runner, the story has spies, espionage and intrigue, worth a read I think.