Suspiria
An American newcomer to a prestigious German ballet academy comes to realize that the school is a front for something sinister amid a series of grisly murders.
Starring Jessica Harper, Stefania Casini, Flavio Bucci, Miguel Bosé, Barbara Magnolfi, Susanna Javicoli, Eva Axén, Rudolf Schündler, Udo Kier, Alida Valli
Watch "Suspiria" on Amazon Prime released in 1977. It's a horror and mystery movie, and has a rating of 7.3 out of 10 from Imdb which is usually fine for this kind of movie.