Every day they clean the dirty windows of their cars from the filthy film that has formed overnight. Measuring stations call a low smog warning. But one day a soccer player collapses on the pitch with breathlessness.

Completely burnt out, without a job or prospects, but with her son Theo in tow, Olga has to bury her high-flying big city and career dreams and seek shelter with her parents back in her home village in her early 30s. While mother Lilo is happy to have the two of them with her, Holger continues to punish daughter and grandson with stoic disregard. Holger cannot forgive Olga for refusing to take over her parents' farm, breaking off her engagement to the young farmer Nico head over heels and simply moving to the big city.

Hubert and Staller find the first body in the forest, the second practically falls into their laps. The trail leads to a retirement home, of all places. The old men finance their retirement by growing cannabis, and they have also been blackmailed, but that doesn't make them murderers. Or does it? Meanwhile, precinct manager Girwidz is hoping for a promotion: his old boss has announced his arrival. However, the police director is in Upper Bavaria for a completely different reason.