Henning finds a potential lead regarding the runaway boy's identity, while Petri turns up at his former workplace yet again – this time armed.

Katja and Dirk arrive in time to stop Mr. Petri's madness and bring him in to the station. Meanwhile, Lothar finds out the truth about their supervisor.

While Dirk bonds with the young runaway, Katja figures out what actually happened at the Harms company.

Petri's colleague is arrested, and Petri and his wife make amends. It's time for Julius, the young runaway, to say goodbye to Harry and go home – but Dirk has one last surprise.

The colleagues at the police station erupt in laughter when they discover a recording featuring their colleague Lothar that has gone viral. Meanwhile, Henning introduces himself as the new “Cop4U” presenter at a local school, where birthday girl Rosa Schimmel happens to be a student…

While Henning is generally pleased with his popularity in his role as Cop4U at the local school, one student is showing him a little too much attention. Meanwhile at the police station, Lothar is given a tricky assignment.

At his apartment, Henning confronts Rosa about the fact that she’s been lying to him. She admits that she has feelings for him. He rejects her advances and finally takes her home — but she’s unlikely to let go of her crush…

Rosa's mother discovers the bruises on her daughter's arm and calls the police. Katja and Dirk ask Rosa about the course of events and the identity of the perpetrator. The answer leaves them speechless...

Katja and Dirk confront Henning regarding Rosa’s accusation. Meanwhile, Lothar tries to follow up on his internal assignment without his colleagues noticing – but then Nicki catches him in the act.

Lothar comes across some astonishing evidence in his hunt for the person who posted his call online. Meanwhile, Henning is suspended from the force, and Rosa seems to be getting closer and closer to her goal.

Dirk, Harry, and Katja speculate about why Rosa would make up such an extreme story about Henning. Henning himself wants to confront Rosa, but Harry stops him; meanwhile, Dirk and Katja pay Rosa’s absentee father a visit on his ship.

Lothar and Nicki find their suspicions about Commissioner Küppers confirmed. Meanwhile, Rosa's father shows up unexpectedly at the family home.

Before Lothar can confront Ms. Kuppers, she sends him and Nikki to check on Mr. Würfelkrütz, where something is amiss. Meanwhile, Rosa realizes that the seriousness of her allegations and tries to contact Henning.

As Mr. Ellwanger gets caught in the act, Henning decides to meet up with Rosa after all. But then Rosa's father turns up unexpectedly...

All's well that ends well! Rosa admits to having made up everything in order to get her father's attention, which means Henning can be reinstated; meanwhile, Lothar finally cracks his case.