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.