Book Blogger Hop: Halloween Edition: What Book Gave You The Creeps?

The Book Blogger Hop is hosted on the site Ramblings of a Coffee Addicted Writer.

Its purpose it to give bloggers a chance to follow other blogs, learn about new books, 

befriend other bloggers, and receive new followers to their own blog. 

Each week bloggers answer a different question. This week's question was:

What Book Gave You The Creeps?

I'm going to name a classic and choose "Carmilla", by Le Fanu. It's a perfect example of slow build done right. There is very little to no plot almost until the end, and the book is narrated in the first person by the main character, so the stakes aren't that high - the reader knows she's going to survive.
I also started reading knowing exactly who, or more precisely what, Carmilla actually is.
Yet all this, which normally would lead me to becoming a frustrated, ranting mess, somehow comes together beautifully.
"Carmilla" was creepy as hell. And it does build-up for 90% of the novella, but the reader gets a final showdown that's worth the wait.