I can definitely see how it's a classic. Ominous vibes and a lot of ambiguity. Fine writing for its time. The ending also left me wondering.

I still love that Haunting on Bly Manor modernized it and added its own creative flare. If you liked the show, you should read the book. Its fun to find some of the scenes parallel. If you liked the book, you should def watch the show. The show even standalone is absolutely a cinematic work of art for the story telling alone.