Any quality epistolary style horror novels out there besides the Big Two?

I'm thinking of rewriting my ghost story as epistolary since it's multiple POV anyway, and want to read some that are well done. I'm already re-reading Dracula for the third or fourth time and I have to say, it really stands up even over a century later. I don't usually get scared by books but this one is giving me chills, despite having read it multiple times!

I realize epistolary is not for everyone, and it's not a traditional way to do horror, but figured I'd ask if anyone has any they recommend.

TIA.