The recommendation
You asked for a film, under 90 minutes, and dark.

movie
1964
Blood and Black Lace
Isabella, a young model, is murdered by a mysterious masked figure at a fashion house in Rome. When her diary, which details the house employees' many vices, disappears, the masked killer begins killing off all the models in and around the house to find it.
Why tonight?
- Under two hours — there is still an evening on the other side of it.
- It goes hard on frights — not a wind-down.
- In Italian — subtitles on.
And you asked for under 90 minutes — that was a hard rule, not a preference.