One of my favorite authors is Shirley Jackson but that doesn’t mean I have read all of her books. I read The Lottery in high school, but it wasn’t until the last ten or so years that I read We Have Always Lived in the Castle. I read her two memoirs: Life Among the Savages and Raising Demons and then I read Come Along with Me, just last year.
I bought The Haunting of Hill House because I do want to read it, but also because its cover art matches We Have Always Lived in the Castle, but haven’t brought myself to open it because I’m afraid to. I’ve seen both films so I know the plot and where the scary parts lie but the book feels more scary somehow. Make sense?
Cedar Waxwing's 365 
The book is stunningly frightening. Both in its supernatural terror and in the mind of a woman losing grip on reality. It is really very scary. I have read it twice and both times loved it and regretted it because I have trouble with sleep as it is and this made it so much harder.
I have her complete works and read all of it. Haunting of Hill House is scary. I cannot imagine watching it. (I read, but didn’t see, The Exorcist.) Don’t know why I think movies are scarier, given how scary one’s own imagination from the deeper words can be…
One movie version of the book, done in the 90s, isn’t much. The black and white one is the first scary movie I ever saw (“The Haunting”), and I saw it before reading the book. The book is far scarier in my opinion.