1930-40 B&W cheapo B murder mystery. One primary scene only. Its location is 99% of the film, no camera panning changes, just pointing down a hallway of a house, which is lined with bedroom doors on both sides. The inside of these bedrooms are never viewed. In each bedroom is a suspect. All of these suspects, about eight of them, spend their time going from one room to the next, randomly, aimlessly. An official tries to conduct his investigation by interviewing the suspect as they appear in the hallway, always by chance. These same suspects are being bumped off, in their rooms, as the movie moves along. The murders have no motive, opportunity is vague, cause off death is never known. Murderer(s) are never found.
I tried to be as verbose as possible but this film, worst movie I ever saw, doesn't allow for much detail.
Thanks for your help, lots of luck on this one.

Jackiestewart