I nominate
Noctuary, by Thomas Ligotti:
ePub from Kobo
here.
Kindle format from Amazon
here.
Mr. Ligotti's web site
here (where I've often found other books not written by Ligotti himself).
A sampling of
Noctuary's reviews on
Goodreads.
Alternatives by the same writer:
My Work Here Is Not Yet Done and
Teatro Grottesco.