Scary fiction subgenres

So we have had the late run on fiction featuring established literary characters - Jasper Fforde and all that. Then there are the bizarre detective novel subgenres; knitting murders, chemical table mysteries, days of the week, letters of the alphabet, cat sleuths, sassy bints and hard boiled blokes. And then there are the Jane Austen rip offs; the Jane Austen Book Club, Flirting with Jane Austen, ad nauseum.
Lets say we combine these all.
Mr Darcy, of Pride and Prejudice fame, has rushed to London to pursue Lydia Bennett and the villainous Mr Wickham. He will salvage her reputation. But he wont spend all the time doing that. Just imagine how many other crimes he could solve, while out there on the mean streets of London. Traversing the slums, dealing out justice and good old fashioned English fisticuffs. It'd be righteous.