Every Nordic crime series begins the same way: a body, a landscape, a detective with a past. “Kallio,” which premiered on Finnish public television last month and begins streaming internationally on Monday, begins with a body, too, a man found dead in a stairwell in the Helsinki neighborhood of the title. By the end of the first episode, the cause of death has been established as a heart attack, the detectives have been reassigned, and the series has quietly revealed that it has no interest in being what you assumed.

What it is interested in is the stairwell, and the 38 people who live in the building it serves. Over eight episodes, the series’ creator, the novelist Aino Virtanen, follows them through a single winter: a Somali-Finnish nurse working nights, a retired tram driver who knew the dead man, a Russian-speaking couple who have stopped speaking to their relatives, a teenage boy who runs a small and surprisingly profitable business reselling sneakers, and the two detectives, who keep coming back, off duty, because something about the building will not let them go.

The series is shot in the real Kallio, a working-class district north of the city center that has gentrified unevenly, and it looks like it: the gray courtyards, the bars that open at 9 a.m., the 3 p.m. darkness of a Finnish December. Ms. Virtanen, who grew up in the neighborhood, writes dialogue that is spare to the point of silence, and the actors, most of them unknown outside Finland, play it with a restraint that reads at first as flatness and then, by the third episode, as something closer to dignity.

The performance to watch is Jussi Rantanen’s as the tram driver, Eero, a widower of 71 who spends the series trying to get the building’s housing cooperative to fix the stairwell lighting and who turns out to be the center of everything. A long scene in the sixth episode, in which he explains to the nurse, over coffee, why he did not call an ambulance for the dead man sooner, is the finest piece of television acting I have seen this year.

The series’ refusal of plot will frustrate some viewers, and it occasionally frustrated me. The seventh episode, in which very little happens to anyone, tests the patience, and a thread involving the sneaker business is dropped and then picked up too late. But the finale, set on New Year’s Eve, brings all 38 residents into the stairwell for reasons I will not spoil, and earns, without a single raised voice, the emotion that eight episodes have been holding back.

The detective genre has given Nordic television its international audience. “Kallio” suggests what that audience might watch next. It is a series about what the detectives see when they are not looking for anything.

“Kallio” streams from Monday. Eight episodes. In Finnish, Somali, and Russian, with subtitles.