I just saw The Innocents from 1961
It's a black and white psychological horror movie in which a governess hired to take care of a couple of children believe the children are being possessed. It is based on the Henry James novel The Turn of the Screw which I haven't read, but I really enjoyed the movie. It was intelligent, very effective in it's cinematography with a thoroughly creepy atmosphere. It's nice to watch a horror classic which doesn't vent suspense each chance it gets with cheap spooks, but keeps building that suspense right up until the very end of the film .. The ending was just lovely and left me guessing which I both love and hate.
Recommended to those who think they might like a creepy, classic horror movie which should appeal to ghost believers and sceptics alike
edit :
By the way, the movie inspired Kate Bush to write the song "The Infant Kiss" which I love of course!