Les Diaboliques -
http://www.imdb.com/title/tt0046911/
[in french, with english subs] [1955][B-W]
This French flick here is the quinessential murder mystery. The director wastes no time developing the story, and grabs you in immediately and the entire 116 minutes are used wisely. The last scene - [no spoilers] was breathtaking and I seriously was freaking out and scared.
Best movie I've seen in quite some time [year?!]...And was also courtesy of the local public library.
10/10
[next up: Hitchcock's 39 steps]