“Das Tagebuch” (“The Diary”) is a one-year short film project by Jan Herdin that was created as part of the Media Design program at Ostfalia University of Applied Sciences. Lisa is a lonely teenager growing up in a single-parent household. She finds it difficult to get along with her fellow classmates and has a crush on her teacher, Mr. Weber.

Franzi confronts her father, Nina has trouble with Max, and the Pellicanos discuss the accusation made against Matteo – while Mr. Sass threatens to call the youth welfare office.

Aunt Dete brings Heidi to the beautiful Alpine village of Dörfli to live with her grandfather, Alm-Öhi. But there are many rumors going around about him, and Heidi doesn’t exactly receive the warmest welcome from the local children.

Matteo is caught by Mr. Sass with the stolen donation box, but claims that it was given to him by… a tiger? With Mr. Sass threatening to punish Matteo for a theft he may not have committed, the Peppercorns get to work on cracking the case.

Nina is acting quite strange... Could it be that she's in love? Meanwhile, the donation box has been stolen from the school administrator’s office!

Jan finds Milla’s mother just in time, and makes sure that she is taken to hospital. But where’s Milla? Emma and Nina go looking for her. With everything resolved, it’s time for the new team of Peppercorns to take the oath.

The Peppercorns finally find out why Nina was bullied at her old school. Meanwhile, Emma has a guilty conscience about having lied on Milla’s behalf — did she do the right thing? Jan heads over the next day to try to sort things out with Milla and her mother in person.

Milla thanks Emma for not exposing the truth during the youth welfare officer’s visit to the apartment. Meanwhile, Max and Henri set off to visit Nina’s old school — and come closer to cracking her secret.

Milla, Leila, and Mark have cleaned the place up for Ms. Wiedemann's visit. Is everything going to go as planned?

Nina gets in trouble with her father when he finds out she was the one who damaged the headmistress’s car. Meanwhile, Leila’s ex-partner Mark shows up to help Milla clean their filthy apartment.

Emma and Nina follow Milla, the girl who ran off with their camera, and confront her in her messy apartment, where she lives with her sick mother. Although they manage to get the camera back, Nina’s relief is clouded by the fact that she feels sorry for Milla.

Emma, Henri, and Max want Nina to join the Peppercorns, but she's very reluctant to engage with them. Emma picks Nina as her partner for a photo project, hoping that she’ll find out more about her. But then something unexpected happens…

If the drug dealer Dragan finds out that the Peppercorns are on his trail, he’ll surely make trouble for them. Fortunately, Emma, Nina, and Max are able hatch a plan to get Dragan arrested before it's too late.

Having broken into Dragan's place, Emma and Nina learn that he is using their classmates to push drugs at their school and others. Suddenly, the dealers come back to their hideout – and the girls are trapped!

After Anna is taken to the hospital, Nina goes to find Emma, only to learn that Emma's in Sankt Pauli trying to trace the origins of the drugs.