Moura, by Virginia Coffman
I saw this recommended as a spooky Gothic read recently, and it was cheap on Kindle, so I snapped it up. Indeed it's a pretty good Gothic!
Anne is housekeeper at a girls' seminary--this is 1815. When a young French student is taken back to her home estate of Moura, Anne gets worried about her and travels to France to check up. She finds an ancient, crumbling chateau, surly servants, a murderous ghost, and plenty of other chilling elements.
It's a good spooky story, dating from 1959 when they knew how to turn 'em out. Unfortunately the Kindle scan is terrible. There are a couple of pages missing at one point, I think some other skipped passages, and lots of typos. That was disappointing.