I’ve been on a cosmic horror kick lately, and what I’d really like to read is stories or novels of the awful and unfathomable on a spaceship. Stories where we go to them, poke what shouldn’t be poked, scan what shouldn’t be scanned, and things proceed from there.
I haven’t read the book, but watched the movie. I think Event Horizon might be what you’re looking for.
I’ve heard references to these sorts of stories in the 40k universe, but again I haven’t read the books.
There’s a couple of short story collections on Kindle called Space Eldritch. It’s been years since I read them, but I remember enjoying them. A little on the pulpier side, but fun.
“The Final Architecture” series by Adrian Tchaikovsky has some elements of this.
Although I wouldn’t consider it an amazing book by any means I found “Infinite” and its sequel very unsettling.
Haven’t seen it suggested yet, so I’ll throw out Linda Nagata’s Inverted Frontier series. Without giving away too much, explorers on the periphery of a collapsed posthuman civilization launch an expedition back towards its center, and along the way find various eldritch monstrosities – of human origin and otherwise – as they try to solve the mystery of the collapse. It’s more thriller than horror in tone, but it checks your other boxes quite well.
Clark Ashton Smith has some cosmic horror stories fitting this description.
The Horus Heresy
Blindsight by Peter Watts (firewall series)
Hyperion by Dan Simmons
Revelation Space series by Alastair Reynolds
Alien by Alan Dean Foster
Thanks for the recs.