The 9th Guest (1934)

IMDb meta-data is runtime 1 hour and 5 minutes, rated 7.0 by 290 cinematizens.
Genre: Mystery
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Verdict: Art /deco steals the show.
Eight strangers are invited to a swish soiree in a splendid penthouse apartment. After wining and dining at a banquet buffet while waiting for the arrival of the mystery host, Siri on the radio informs them that the ninth guest is DEATH. Each will be murdered. These are Eight Little Indians off the Agatha Christie reservation.
In the penthouse doors are locked, gates carry an electric charge, stairwell doors have been welded shut, windows cannot be opened, the balcony is on the thirtieth floor – too high for shouting or jumping. The fraternity brothers suggested throwing furniture off the balcony to bring a reaction.
There is no escape. They must endure the McKinsey management training seminar that will lead to their deaths. I know the feeling.
The mystery is why they are there and who is the mastermind. There are connections among some but not all of them. None is innocent. They include an oily dean from a university, an egotistical assistant professor from the same university, a political fixer and his mistress, a shyster (aka lawyer), a self-appointed do-gooder, a hypocritical society hostess, a starlet trying to sleep her way to the top, and – shock – an unscrupulous journalist.
They all wear the most formal Tuxedo Park attire, and proclaim their ignorance and innocence. The former is credible but the latter is not.
What follows is a character study as each guest reacts to the doom the awaits. Some panic and in so doing hasten their own end. Others go all rational and try to figure it out. Some read spam email. Others close in on themselves, but no one turns to prayer. There is a butler for comic relief, and mercifully he is not a she or a black. For such a static story, the direction is crisp.
The art deco set and the 1930s hi-tech are marvellous. It makes it a variant of the Old Dark House with all its quirks, lurks, traps, sliding panels, disappearing objects, talking radio, and more.