If you like action type movies, then you will not be interested in this one, If you like intriguing movies, then this may be something you might like.
I started to watch it, but found the pace a bit slow and quit. Then I went back to it a few days later and picked up where I left off. The movie turned out to be very good.
The movie is apparently about an English upper Class family, who is paid a formal visit by an English police inspector. The inspector is making inquires about a destitute young woman who committed suicide by drinking disinfectant. The time period seems to be around the 1950s - 1960s. They had telephones, in the movie.
Bill,
Here is a YouTube link
https://m.youtube.com/watch?v=Vukp3EFVweQ
Unlike most of the time on the Internet, the comments on this are interesting. Looks like it was studied in an English Literature class and was originally a play.