When her opponent in the ring suffers a heart attack, boxer Martina Oberholzer (Tabea Buser) is prompted to stop doping immediately. She also wants to tell the press everything she knows about the background of the doping scene. To stop her, her corrupt manager Sven Brügger (Urs Humbel) locks Martina in an air raid shelter. Shortly thereafter, Brügger is shot. At the scene of the crime, investigators Reto Flückiger (Stefan Gubser) and Liz Ritschard (Delia Mayer) not only come across the dead boxing manager, but also Heinz Oberholzer (Peter Jecklin), who immediately confesses to the murder: Heinz is an ex-policeman and Martina's uncle. He shot and killed Brügger in an argument when he wanted to get the whereabouts of the kidnapped boxer out of him. So the murder case is solved quickly.
But what will become of Martina now? How are Flückiger and Ritschard supposed to find the kidnapped woman? Now that Brügger is dead, nobody seems to know where she is locked up. The situation is exacerbated by the desperate tip from Ferdi Oberholzer (Ingo Ospelt), Martina's father and at the same time her trainer: Due to the doping, his daughter suffers from increased fluid loss. Two days at the most, then she will have died of thirst if she doesn't get anything to drink. Time is pressing and the confessed murderer Heinz Oberholzer has a plan: He wants to be transferred to the prison where Pius Küng (Pit-Arne Pietz) is being held. Küng is the unscrupulous mastermind of the doping ring. Only he could know Martina's whereabouts.
But the plan is highly risky: As a former police officer, Heinz will have to be prepared for revenge from his former clients in prison. Nevertheless, Liz is committed to the project - even beyond the borders of legality. She knows Heinz from the beginning of her police career: he was once her instructor and she seems to trust him blindly - which increasingly irritates Flückiger. A rare conflict looms between the investigators - in their penultimate case together.