Hannes Seidel lies dead in the shaft of a multi-storey car park. Camera images show a dispute between him and his 17-year-old niece Lilly – there has been no trace of her since then. The altercation between the two could be related to Lilly's previous shopping mall smoke attack, which she committed with two other people. Is her escape an admission of guilt? The investigators immediately issue a manhunt for the young environmental activist. When Heffler and Neumann visit Lilly's father in the thriving family business, the latter states that he has no idea of his daughter's whereabouts. The relationship between father and daughter seems to be very tense.When it turns out that Lilly will inherit the small boat factory when she comes of age and wants to take over the management from her father, Jochen Seidel is targeted by the investigators. Did Lilly want to use her beloved Uncle Hannes, with whom she wanted to lead the company into a greener and more sustainable future? Jochen was strictly against it. Lilly could provide the answer, but she remains as if swallowed up by the face of the earth. In search of her, the tracks lead to an online platform - the "Nature Future Friends", where Lilly was active. Julia Bernhoff, who was present at the smoke attack, could provide information on this. She does not reveal who the third person was. The investigators should contact Mark Nowak, a lecturer at the university. But even he can't really help the investigators.Meanwhile, Robert is struggling with his daughter Charlotta's new career aspirations, which is pushing him to his limits. The situation comes to a head when the results from forensic medicine are available. Hannes Seidel was still alive after the fall and was subsequently suffocated. Was Lilly really the perpetrator or did she witness the murder and is now in mortal danger herself? Heffler and Neumann suddenly recognize the game of power and manipulation and know who is pulling the strings.

After her shift, trainee Annabelle is pushed in front of a moving truck at a bus stop. She dies at the scene. Mavi breathes a sigh of relief because her mother does not have dementia after all. Meanwhile, Robert is worried about Emmi, who is admitted to the hospital where the murder victim worked with stomach pains. While Mavi asks around in the hospital, Robert speaks to Annabelle's flatmate Zoe and her boyfriend Tobias. In her room, Robert finds secretly taken photos of the victim and threatening letters addressed to her. Did someone want to scare her?

When 42-year-old Sina Priemke is beaten to death in a forest, the trail quickly leads to the university where she taught as a lecturer in computer science. Shortly before her death, Sina listened to secretly recorded, obscene audio recordings between her superior, Professor Brenneisen, and a certain Melanie. This is why the professor is immediately targeted by investigators. As it turns out, all the students and Professor Brenneisen received these audio recordings at the same time. From whom? And who is the unknown Melanie? Neither Brenneisen, nor any of the students, nor Sina's brother André know her.