A young woman is found murdered in an apartment in Lucerne. For Reto Flückiger and his colleague Liz Ritschard, everything initially indicates a relationship act. Thomas Behrens, the lover of the murder victim, is suspected. But the IT specialist recently disappeared. Surprisingly, his wife Ilka alerted the police. She is followed by an unknown car with tinted windows. Apparently her husband is trying to intimidate her because she wants to leave him. Flückiger takes care of the seemingly disturbed woman, but finds neither clues to the wanted nor to any persecutor. In the meantime, Behrens faces the authorities. The computer scientist claims they wanted to kill him because he stole sensitive account data from his employer, a well-known private bank. When he panics and rioted in the interrogation room, he was admitted to a psychiatric ward. He takes his own life that same night, but for Flückiger it doesn't look like suicide. Suddenly he feels persecuted too.
—ARD Das Erste