I am looking for the title of an old thriller/mystery film that once aired on PBS. The memory is kind of fuzzy, but there was a young woman staying in a mansion with several other people. It's unclear if she lives there or is visiting. Anyway, the lights keep going out and one by one people disappear. Towards the end when we see what really happened to them, we see a wing chair in a corner, and her father or grandfather in the shadows, pulling a lever that opens up the floor, and the person in the chair falls into a pit of water under the house. There may or may not be crocodiles. I know it's not a lot to go on, but if anyone has any ideas I would REALLY appreciate it.
Thanks!
Molly
