While working in the greenhouse, Patrick Teichmann discovers the body of his mother-in-law Heike Teichmann. The gardener's helper Juri flees with the murder weapon in his hand and is the first to be targeted by investigators Gorniak and Winkler. But the victim's daughter, Nadine Teichmann, is also a possible perpetrator. At the crime scene, the detectives experience a family business that seems far removed from the peaceful coexistence of three generations under one roof. There can also be no question of marital harmony between Nadine and her husband Patrick Teichmann - they are about to separate.

Events take a new turn when an important witness is eliminated and the autopsy reveals that Heike Teichmann suffered from broken heart syndrome. The detectives use psychological sensitivity to uncover the truth - which leads far into Heike Teichmann's past. Now her daughter Nadine, who was just a suspect, also has to fear for her life.

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