It takes place in a bizarre (and prestigious) dance academy where some of the more curious students seem to be dying in very strange and mysterious ways, by the hands of something living...or perhaps dead? It's an absolute visual feast, a movie that demands full attention if it is to be appreciated. I had put off watching Suspiria for a long time because of the hype, and that generally kills a movie for me. I really wish I hadn't, but I'm also glad I did, because seeing this as an adult really helped me to appreciate the brilliant cinematic qualities of this movie.
If you like witches. If you like magic. If you like horror. Faerie tales. Creative murder scenes. Creepy children. Weird tall men with ugly teeth. Intriguing camera techniques. Beautiful architecture. Intense lighting design. Any of this...you need to watch Suspiria as soon as possible.