Maybe it's nostalgia, maybe it was the disappointment of the last book, maybe the potato finally got digested, whatever it was I quite enjoyed this. Unlike the heroine I have a bit of familiarity with gothic conventions, so there weren't a lot of surprises, not that I expected any. But now I would like to do some kind of survey of the genre, noting popular locales (Cornwall and Scotland, of course, but where else), characteristics of the leads, relationship with the servents, what happened to the first wife, etc. No doubt the time of the writing has more influence on these attributes than the supposed setting year.
Fun times with old houses and dark doubts.
Would also work for Romantic Suspense, Terrifying Women, Gothic, Country House Mystery, and Amateur Sleuth.