Some horror-y, some thriller-y, some ive recād elsewhere on here:
-the wasp factory, iain banks (!!)
-fever dream, Samanta schweblin (!!)
-Iām thinking of ending things, Iain reed
-out, natsuo kirino
-the faces, tove ditlevsen
-Eileen, otessa moshfegh
-we have always lived in the castle, Shirley jackson
None are too gory but i did find out and the wasp factory to be more disturbing personally.
theyre manga so not traditional novels, but I read through both Tomie and Uzumaki by junji ito a couple years back, and theyāre deliciously creepy, scary, a little gross.