Diabolique
I’ve listened to so many commentaries on my various giallo DVDs that cite this movie as one of the primary touchstones of the genre. The plot follows two women who devise a plan to kill their mutual husband/lover. Things don’t go as expected and we are left wondering if he is still alive (or undead). I mostly enjoyed the film and the moody climax is the real reason to watch, but it felt a bit too slow to warrant the two hour running time.