The police students Inka, AC, Kilian and Marc accidentally witness a murder in a cinema and slip straight into the investigation. The victim is a student who was brutally stabbed unnoticed during a performance.
The dean of the police academy, Professor Daniel Goldenbogen, is found dead in his office. The suspect is the student Leonie Ruska, who had an affair with him. Only Inka, Leonie's friend and roommate, believes in her innocence.
The lawyer Dr. Schmied is murdered in her villa at night. Was it the desperate act of her ex-husband Gregor or that of her son Hugo, who were coldly discarded after the divorce? The broken window points to a burglar.
A young woman is found shot dead in the forest. When the police investigate the crime scene, Marc finds another body, also a young woman, who has been lying there for many years. Are the two finds connected?
The ambitious employee Thamina Issa is found dead in a car dealership. To Malouf's horror, his own son Bassam is suspected of murder. Bassam, who is doing his apprenticeship at the car dealership, is also accused of stealing spare parts.
Real estate developer Sebastian Kleine is brutally murdered in a hotel. He has been hit with targeted punches. The former world boxing champion Marcel John comes under suspicion. John has boxer's dementia and lives in a room in the hotel.
The geriatric nurse Martina Kirsch was knocked down. Everything points to an attempted murder. She lives separately from her husband, Andreas Kirsch, who is considered violent. There was a dispute over custody of their son Niklas.
A young man from Afghanistan, Nuri Kohzad, is stabbed to death at night. The investigation leads to Helge Schweiger, who makes no secret of his xenophobic views. When Marc and Kilian try to arrest Helge, he flees.
Museum employee Isabell Schütz is strangled in her office. Her 18-year-old son Samuel is suspected. He had already attacked her a few months earlier. Regina, the victim's mother, explains that her grandson suffers from schizophrenia.
Hannemann, who has murdered multiple women, has escaped from prison. Kelting is alarmed. He had him arrested several years ago with a large police presence. At the same time, the body of Jost Giering is found in a park.
A judge is ruthlessly run over by a car in front of the court. He was notorious for his harsh sentences. Only recently, a convicted Iraqi had clearly threatened him. During the investigation, his partner Monique emerges as a suspect.
It is becoming increasingly clear that the murder of Dean Goldenbogen and that of his sister Helene are connected. Goldenbogen had discovered that Helene had never been in Australia. Before he could share his knowledge, he was killed.
