Emma's new classmate Nina is accused of theft. Together with her fellow student Max, Emma sets out to search for clues.

Max is being blackmailed by drug dealer Dragan and is forced to sell "Happy Pills" at school. Henri senses another case and falls under suspicion himself.

Nina and Emma get robbed. When they confront the thief, they see how she lives at home. Meanwhile, the Pfefferkörner (Peppercorns) discover that Nina is also hiding something.

Emma and Max find a suitcase with a pair of sneakers in the bulk waste. Shortly after, there is a break-in at the Krogmanns' house and Henri's dog Feline disappears.

The Sudanese girl Acai helps Henri after a fall, but then disappears with Emma's bicycle. The Peppercorns observe her selling illegal cigarettes with her mother.

The Peppercorns suspect blackmail: A female classmate was filmed while changing in the school locker room and is now being asked to pay money to prevent the video from being posted on the internet.

Henri's mother is visiting and wants to take her son with her to Africa. When Henri discovers smuggled ivory, he ventures on a dangerous solo mission.

Ben has supposedly composed the perfect song for Nina. Using a clever plan and sophisticated technology, Nina, Emma, Max, and Henri lure music dealers into a trap.

A pub owner sees Grandma Leni as competition. Her customers are scared away and the next day her food truck disappears. The Peppercorns set out to search for it.

Grandma Leni is hospitalized and gets robbed there. To avoid worrying her even more, Max doesn't call the police but instead sets out with the Peppercorns to search for the thief.

Matteo is suspected of stealing the school's donation box. The Peppercorns want to prove his innocence. In doing so, they receive help from boxer Henry Maske.

The flower beds for the competition "Germany's Most Beautiful School Garden" have been vandalized. Is someone trying to take revenge on Nina's father? Emma's trail leads to a houseboat.

Henri discovers radioactively contaminated tea in the headquarters. Nobody believes him. But then Henri gets kidnapped. Meanwhile, Nina wants to improve her relationship with Max.

After Emma and Henri have emigrated, Nina and Max find two new Peppercorns in Jessi and Luis. Together they help homeless people who are about to be driven out of the HafenCity.

School life is being disrupted by malicious pranks. The school principal is also being threatened. Is a former student who was expelled from school behind it?

Jessi falls in love with her hip-hop teacher Chuoc at the youth center. When she realizes that he is involved in criminal activities, it seems to be already too late.

The Peppercorns discover that pills are being switched among residents in the senior home. Nina's former neighbor is also affected. Max observes the nursing staff.

Jessi is supposed to catalog stuffed animals for a job. But thieves use her key to gain access to the villa. Is a handyman behind the theft?

Max sneaks into a club that films dangerous dares for the internet. He puts himself in danger, and then Nina also wants to take a break from their relationship.

Grandma Leni's historical cookbook containing the original recipe for currywurst has been stolen. The Peppercorns suspect Fish-Heini, but then Luis disappears.

An angel statue is stolen from the cemetery. The Peppercorns investigate the von der Hagen sculptor family and research the topic of occultism.

Is Max's friend a neo-Nazi and involved in an attack on Nina's brother? The Peppercorns investigate in the environment of a group of right-wing radical youth.

Luis has a new hobby: treasure hunting using GPS. In the process, he gets locked in a tunnel system with Jessi and Feline. Can Max and Nina help their friends in time?

Max has a new girlfriend. Luis and Jessi try to support Nina. She loses her theater role and falls under suspicion of having poisoned her rival.

The Peppercorns investigate an unappetizing case. An endangered snake is supposed to be eaten as a delicacy. Meanwhile, Luis receives a visit from his father.

Dog Feline becomes sick after running across a construction site. A hotel design by Jessi's father is supposed to be built there. Was toxic waste illegally disposed of here?

Nina has to move to Italy with her family. Saying goodbye to Max and her friends is difficult for her. But then the Peppercorns have to catch a pickpocket.

Jessi has a hard time with new Peppercorns. But when her classmate Jiao disappears, Luis convinces her to investigate with Niklas, Anton, and Ceyda.

The Peppercorns support Jessi during climbing training. Suddenly they are threatened. A photo leads to the blackmailers who make money with criminal sports betting.

Niklas is afraid: His mother is suspected of theft. The Peppercorns want to prove the mother's innocence. They suspect the real perpetrator is at the campground.

Luis' dog Feline suddenly becomes very ill: She ate poisoned dog bait in the park. The Peppercorns set out to find the perpetrator.

Ceyda is offered cheat sheets for a school dictation. She gets filmed and is blackmailed with the footage: Ceyda risks being expelled from school. Jessi is also keeping a secret.

Anton is desperate: A classmate falsely claims that Anton attacked him. He needs the help of the other Peppercorns - but they are distracted.

On Alex and Isabell's wedding day, there is great excitement. Luis is in the hands of arms dealers. And Erol and Anton are suspected of being connected to terrorists.

While Niklas is suspected of stealing jewelry at a party, Ceyda only has eyes for her big crush Ivo. Does he have anything to do with the thefts?

Grandma Leni was given counterfeit money, now she fears for her livelihood. Niklas soon has a suspect, but this also puts him in a dilemma.

The Peppercorns are searching for stolen strollers. Then Niklas' mother Janin disappears. Is there a connection?

At the boat storage facility, a customer's yacht is stolen. The insurance company refuses to pay, and Erol's existence is at stake.

While wedding preparations for Isabell and Alex are underway, there's a break-in at the headquarters. The Peppercorns try to investigate without the bride and groom noticing.