Best Horror Genre Book (or Series) NOMINATIONS NEEDED

What is the best Horror genre book (or series)?  

Remember that we're rerunning some of our most popular polls of the past few years, but this time we're doing it with lots more voters (and we'll be keeping the results on display.) It's all part of our new Sticky Polls--the 2019 roll out for polls here at Writing About Writing.

The Rules

(I know this is the fourth round of polls we've done under the new rules, but now that we've done a couple, you can see what I mean by some of this):

1. I have a special rule for this poll because of how niche the genre is (even though we're talking about hundreds of years). Only TWO BOOKS from a single author will go on to our poll. Whatever the most "seconded" two books are, they'll go on to our poll. I'm not going to oversee a poll that is half Stephen King.
2. There is a new category of nomination. It is NOT a nomination for the poll. It is an UNDERSUNG HERO nomination. Basically it is for books you think are great, tragically overlooked, but maybe not necessarily the besty bestest best. I will be listing these books along with the poll results. However, if you nominate a book for our poll it will not be considered for the undersung hero list and if you shout out something for an undersung hero, it will not be counted as a nomination for the poll. (Someone else can nominate it.) Think about if you want to give a book few seem to know about a shout out or if you're tossing your fave into The Hunger Games.
3. As always, I leave the niggling over the definition of genres to your best judgement because I'd rather be inclusive. If you want to nominate John Dies at the End, I'm not going to argue that it's probably less horror than comedy or science fiction, but YOU have to convince others if you're going to get on the poll--nevermind win.
4. You get to mention two (2) books (or series). That's it. Two. You can do ONE nomination for the poll and ONE UNDERSUNG HERO.  Or you can do TWO nominations. Or you can do TWO undersung heroes. But two is the total. If you nominate three or more I will NOT take any nominations beyond the second that you suggest. I'm sorry that I'm a stickler on this, but I compile these polls myself and it's a pain when people drop a megalodon list every decent book they can remember of in the genre. It is up to you how to divy your TWO choices. TWO.
5. Did I mention two?
6. You may (and absolutely should) second AS MANY nominations of others as you wish. THEY WILL NOT GET ONTO THE POLL WITHOUT SECONDS. You can agree with or cheer on the undersung heroes, but they won't "transform" into nominations unless someone else nominates that same book as "best" (and then they get a second). Also stop back in and see if anyone has put up something you want to see go onto the poll. 
7. Put your nominations HERE. I will take nominations only as comments and only on this post. (No comments on FB posts will be considered nominations.) If you can't comment for some reason because of Blogger, send me an email (chris.brecheen@gmail.com) stating exactly that and what your nomination is, and I will personally put your comment up. I am not likely to see a comment on social media even if it says you were unable to leave a comment here. 
8. You are nominating WRITTEN genre fiction, not their movie portrayals. If you thought the The Hunger Games movies were the shiznit, but thought the books were not written very well and slow, nominate something else.
9. This is probably well known by vets of this blog by now, but there will be no more endless elimination rounds. I will take somewhere between 8-20 best performing titles and at MOST run a single semifinal round. By "performing" I mean the seconds. So second the titles you want even if they already have one. (Yes, I guess that would make them "thirds," "fourths," etc...) The competition on this poll might be fierce. You may have to get your friends involved. Buy them a pizza. Make it real. 
10. TWO!