Anthology film following six stories of strangers briefly meeting on the Rome Metro.

Palace Hotel, Rome, the story begins with the Demitri couple, who turn out to be in a marital crisis due to their not having sex for quite some time. The husband says he has no time for that because it has to go to the interior of the Quirinal offices, but in secretly he has a date with a married woman, Mrs. Rolandi.

A woman dressed in black is murdering young women. The police question lawyer Anselmi for whom one of the girls worked as a secretary, and it turns out that all the victims were friends of lawyer's wife Leonora.