Summary Tanja Relitz, an assistant of a chemical lab run by Ulrike Lichter in the Altes Land, is found dying by police officer Sarah Kohr and is soon dead. Sarah identifies Thomas Lichter, Relitz's lover and Ulrike Lichter's separating husband, as the only suspect. Sarah is now working together with the policemen Anna Mehringer and Dietmar Liebknecht. When she confronts the fugitive Thomas, who is on the hunt for the real murderer of Relitz, he is shot and seriously wounded, so Sarah hides him in his friend Götz Weiler's house. She doesn't know whether she can trust her police colleagues because shortly after she visited an informant Jakub Romanovsky in the prison, he was found hanging in his cell. Sarah's investigation focuses on the former street gangsters who are now hired as "security guards" at Leuré Chemicals Company. They sell fertilizers and pesticides to the fruit growing companies in the Altes Land, which are the main customers of the Lichter chemical lab. Sarah confronts Ulrike, who now admits that her soil analyzes detected a nerve agent that came from Leuré Chemicals' fertilizers and pesticides. With this knowledge, she blackmailed Leuré Chemicals, whereupon they tried to eliminate her, but mistakenly hit her lab assistant Relitz. In the middle of her confession, Ulrike is killed by the gangsters. With Dietmar Liebknecht already killed, they also try to kill Thomas Lichter, Götz Weiler, and Anna Mehringer. Sarah manages to stop them in time. Leuré Chemicals boss Fabian Täufer is then arrested by Anna Mehringer.

• Crime