Looking for a book that I can gift to someone who likes ‘darker’ stories, something he is unlikely to have read

I have only very, very recently got into reading. I am aware of all of the classics, but have not read a lot beyond suggestions from a colleague.

As luck would have it, I have now drawn this colleague for Secret Santa and would like to provide him with a horror book that he is unlikely to have read.

He reads a lot and I suspect he has already read all of the classics and is now exploring more niche books and genres, but I’d like to surprise him with a dark horror novel (and some whiskey).