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.

Borchert and Dominique Kuster take over the defense of the taxi driver Jrg Zollinger. Captain Furrer suspects him of the murder of a passenger, the African investigative journalist Nuka Baluba. All the evidence incriminates the uncontrolled suspect, whose testimony initially seems unreliable. Borchert is suspicious of the fact that public prosecutor Dietrich is quick to commit to Zollinger. The "lawyer without a license" suspects that Baluba's research into child labor in cobalt mines in the Congo has something to do with the murder.

When Borchert receives an anonymous message that a certain Franz Brosi is innocent, law firm boss Dominique can hardly believe it. After all, Brosi was her first client as a public defender a few years ago and had actually confessed. The two are investigating the case.

Youth psychologist Julia Egger causes a traffic accident, seriously injuring a man, and drives away in panic. Her explanation that she was deliberately forced off the road by an SUV initially sounds unconvincing to Borchert and Dominique, especially since Julia has a history of drunk driving.

What begins as a routine assignment develops into a dramatic kidnapping case involving difficult detective work for the "lawyer without a license." The title character finds himself caught between his loyalty to the family of an old friend, his relentless pursuit of the truth, and his lifelong trauma of having failed as a father himself.

Thomas Borchert stands by his conviction as an "unlicensed lawyer" never to neglect humanity when representing a client. This distinguishes him from his friend and colleague Reto, who, as a victim, witness, and legal counsel, is accused of always being "more lawyer than human being." What begins with a robbery at a pharmacy develops into an unusual case of drug crime: the trafficking of high-priced medicines.

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

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.

Borchert and his boss Dominique can't believe it: Captain Furrer, respected top investigator of the Zurich Criminal Investigation Department and fair opponent of the unorthodox lawyer duo, is now himself under urgent suspicion of murder! Corrupt colleagues want to pin the murder of young policewoman Emmi, who could have been dangerous to them as a witness, on him. Emmi had confided in her mentor Furrer that brothel owner Jean Berger had been deliberately shot during a raid by colleagues. Now Furrer fears he will be eliminated himself. With Dominique's help, the suspended captain goes into hiding to prove his innocence on his own.

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.