Second in a series. Historical mystery, and no, that is not a code term for sleazy romance novel. No sex at all so far.
I found the first book a bit two dimensional and predictable. Ever character had a terrible past, a serious condition, or was just a homicidal lunatic. Obviously, it wasn't too bad though, as I'm reading the second.
It is set in London in the 1800's. Apparently, the detail is accurate and wonderful; I'm no expert.
I'm not very far into this one, it's better than its predecessor so far.