The Night Bird by Brian Freeman is also fantastic but leans heavily into more psychological thriller

5

I Know You’re Still in There by Bailey Elizabeth for possession with a twist. TankerTanner by Payne Sillavan for a horror from the POV of house cats. Sleeping Among Wolves for a really well done zombie concept with a tragic romance too. Binding of Bloom Mountain or Metropolis Down by Vesper Doom are fun too.

4

The I am legend book is pretty awesome and I never hear much about talk about it. Many copies come with a bunch of horror short stories as well!

3

Into the Drowning Deep by Mira Grant!!! Mermaid horror done really super well. Tho anything by Mira Grant is top notch. Scott Sigler has some good creatures-hunting-people books also, Infected freaked me out enough that I stopped reading for like a month.

2

This isn’t niche but not enough people have read Misery by Stephen King

1