I'm aware of the "Sharp" books - the UK TV series over here is very popular and, from what I can tell, very good.

Oddly enough, another fictional character, from the Victorian novel "Tom Brown's Schooldays" - Flashman - has been reincarnated in the excellent novels by the late George MacDonald Fraser. His research was also excellent, and I believe one of the Flashman novels is set against the background of the American Civil War.