Parkstrasse 13 (1939)

The beautiful Evelyne Schratt, who has many admirerers, and whose two husbands both died under mysterious circumstances, is giving a reception. When one of her admirers is found stabbed to death in a room upstairs, the police detains everyone in the house and begins an interrogation (oh goody: does dinner come with this mystery theatre, too?). Evelyne admits, that the murdered man tried to blackmail about some information he had about the death of the two husbands.

Unfortunately the movie Parkstrasse 13 is not yet available on HBO Max.