Marge honey, you would LOVE maybe the second or so episode of THRILLER ever produced. It was a star vehicle for Constance Ford, the evil frigid b-i-t-c-h in THE SUMMER PLACE (sternly instructing a pouting Sandra Dee--"you gotta HOOK a man--you can't just let him kiss and MAUL you like that!"). I don't recall the plot details and I am looking forward to watching it again at some point. I just remember she plays this conniving woman scheming to get her hands on some money, there's a big old mansion, and a plot more reminiscent of ALFRED HITCHCOCK PRESENTS than the supernatural stuff referenced in this thread.
Because of the timing of when it's on, I mostly miss the beginning of it, but end up seeing most of the rest. Even with that, a lot of them have been very good. I saw most of the one you're referring to. I just looked it up - it's the 3rd episode, "Worse than Murder." By now I don't remember much about it, but if it's the one I'm thinking of, it was good.