Harry and Nils pick up a running young girl that doesn't speak but plays excellent chess. An unconscious injured man, Arkadi Popov, is brought to the hospital. Thorsten from the chess club is suspect; can a phone-ID spoof fool the police?

Alfi means that his former best friend Helmut has forsaken him; Helmut tries to restore their friendship. Hans accuses Teddy and Alfi of burglary. Sunny seems under influence and is put into custody.

Harry's first big love Robert seems to have committed suicide; Regina is his therapist. A woman in Erika's store is stolen a wallet; her credit card is on Robert's name. Helmut is mocked for the pair of glasses that Küppers gave him.

Petty thefts on several building sites. Nuri steals a hot dog bicycle to bring Trotzki euro 50,000. She's a lotto multimillionaires and member of a community that illegally occupies a building. Daniel seeks the police unit's lotto ticket.

Former detainee Malte is suspected of jewel theft in old people's home Nuper Fortuna. Former archaeologist Friederike longs for Spain. Legal student Lea films landlord Martin against his will. Helmut seeks a care place for his mother.

Tennis player Marc (17) and Liliane demolish the kiosk of Murat. Child-detectives Clarissa and Olufemi reveal the police the systemic of a gang of thieves. Helmut finds a winning QR-code that he wants to save Daniel's marriage.

In the almost solvent beer brewery of Anni and Lilli somebody sabotages the kettles at 4:30 a.m.; grumpy Vincent or bar manager Julia? Bicycle thefts peek enormously; victim Daniel and Helmut find traces to the perpetrator.

Harry is 30 years in service; colleagues prepare a celebration. Küppers friend Isabelle seems to be a shoplifter and an investment impostor. Kurt accuses Onna of setting his tea warehouse on fire.

On Sandra's fashion show for curvy women a dirt biker shoots paint on a model. Almost the same time her store has been attacked. Nearby shop owner Sven claims he didn't notice anything. Sandra's ex, teacher Eric, tries to get her back.

During a riot because of security camera's cop Daniel is beaten up. But Manuela accuses him of trying to beat her which she previous did with two other riot policemen. When Daniel resigns he realizes that he neglected his civilian life.

For years Judith has been cleaning Lukas's shirts. Now her laundry is trouble - she can't tackle the rent anymore, and petty crook Keule who is eyeing Judith's daughter Frauke is also in cahoots with a shady restaurant owner.

Undercover Nils executes for Falk, owner of Pink Lotus Nightclub, the symbol to call Bella's Nightclub a traitor. Police catches armed Luda who has a daughter with Falk. Silvia seeks her sister. LKA seems to undermine the action of PK14.