Lord John and the Private Matter

by Diana Gabaldon. I think her very popular book series might be bodice-rippers, but there are no ripped bodices in this one (although there are a couple of discarded or open shirts!). Lord John is a supporting character in her other books, and this novel (first in a series) does spark my interest in her other books. Set in 18th-century London, Lord John sets out to solve two intertwined mysteries.