Hi. I don't really think this is a OSB episode, bu the folks I asked on the old movie site thought it might be. It's been driving me crazy for 20 years. Maybe someone can help.
The ending, at least, goes like this:
So, it was black and white and the woman I remember in the movie had on one of those 40s or 50s dresses: the bell shaped skirt passed the knee. I think the family is in a country house somewhere and I believe they are there because of one family member: the woman in the dress. They think she's crazy or is having some sort of nervous breakdown. The entire family leaves for some sort of outing and decides that she should stay home and rest. She doesn't want to be left alone, but I think they give her some sort of sedative and make her stay home. So, when it gets dark, these creature things come out, of the vent somehow I think, and come after her. Because she's sedated, she's not fully able to pull away and these creature things drag her down a huge old fashioned stair case. On the way down, she pulls over a little table/stand of some sort and gets her hands on a camera. She takes pictures to get the flash to go off—apparently the creatures don't like the flash. But that only buys her a little time. Eventually, the creatures win and drag her down into a vent either near or on the floor at the bottom of the stairs. I think that's how it ends.
Any of this sound familiar to anyone?