Lawyer Dominique Kuster can feel a professional success for herself when her underage client Stefan, the oldest of three foster children, receives mitigating circumstances. After the court hearing, however, she found out that the foster father Christian Hunziker had a fatal accident in a car. An autopsy reveals that it was murder. Someone has swapped the dead man's insulin for ineffective water. Christian's wife Martina comes under suspicion.

Borchert wants to toast three years of successful cooperation with his superior Dominique Kuster and her father, Reto Zanger. The evening is canceled because Reto Zanger is called to Geneva at short notice for a mandate. His daughter is therefore supposed to represent him at a court hearing in Zurich. The trial takes a dramatic turn when inmate Alexander Böni takes those involved as hostages.

The owner of the Zurich strip club Orchidee is shot dead by a police raid in self-defense. The police officer Emmi Arnold who was involved in the raid confesses to Captain Marco Furrer that the operation was bogus. A little later, the talkative policewoman is murdered. Furrer is under urgent suspicion of murder, who is then suspended. Borchert wants to help his friend, who meanwhile wants to prove his innocence to the major on his own.

The lawyers Borchert and Kuster are investigating a case involving a young student who has come under the crosshairs of a terrorist group.

The building contractor Hubert Thalmann is found stabbed to death by the young burglars Tim and Robin in his villa. The next day Tim goes to the police, the lawyer Thomas Borchert and his superior Dominique Kuster represent the youth in all subsequent instances. They believe in his innocence because he is also covering his friend Robin. During the investigation it turns out that both Thalmann's wife Vera and his brother Bernard have a motive.

Anton Schneider says goodbye to his wife Luise in tears and dies. Schneider was seriously ill with multiple sclerosis and was diagnosed by neurologist Dr. Hoffer medically treated. Luise Schneider reports the doctor and accuses him of incorrect treatment of her husband, which ultimately led to his death. The mandate against Dr. Hoffer takes over Dominique Kuster, who entrusts her employee Thomas Borchert with the investigation.

Attorney Thomas Borchert is in custody, where he is accused of bribery and embezzlement. His former supervisor Horst Zeidler advises him to take the blame in order to then make a deal with the public prosecutor. Borchert rejects the offer. He wants to prove his innocence by legal means and is looking for a suitable defense for himself in court.

After many years, Thomas Borchert is returning to Zurich. As soon as he arrives, the rough lawyer takes on the police and some former friends. The Filipino nanny Amihan, who was caught stealing in the market, is suspected of being involved in the kidnapping of a young boy.