Tatort (= “Scene of Crime”) is a crime series made in Germany, Switzerland and Austria. Every Sunday, an episode shot in one of the countries is aired. The countries each get their turn, of course. In each of the countries, there are several teams of investigators, and every team also gets their turn.
Public viewing is one reason why Tatort has risen in popularity again: in every bigger city, there are at least one or two locations where one can watch and investigate with friends.