Oh I love a spooky book!!
Cannot recommend Michelle Paver more with Dark Matter and Thin Air. Two of the few books I've reread and also listened to in audible several times. Waykenhurst was also good but not as good as these two for me.
Laura Purcell is brilliant for the more gothic spooky, and also agree Grady Hendrix is great for scary and weirdly fun. I loved Horrorstor and Final Girls Support Group and How to sell a Haunted House.
The Troop by Nick Cutter was really good so plan to hunt out some more of his books.
Two I've read recently are September House by Clarissa Orlando - a great take on the haunted house story and has a lot of ghosts.
The other I'm halfway through and absolutely loving is Ask for Andrea by Noelle Ihli, a great ghost/thriller story. A serial killer is stalking through dating sites and murders 3 women over a few years, each become ghosts and try to deal with their deaths and wanting to bring him to justice, then they manage to join forces. It sounds a bit odd but it's great, really well done and I'm devouring it.
Next up are Weyward, Mexican Gothic and Moon Stone 😁