The 3a class has a reputation for being particularly difficult. Max is the boss, and with his followers, he controls the class. Julian tries to navigate the school using an invisibility tactic. And Amelie wishes for nothing more than a friend, but she isn't cool enough for the popular girls. However, everything suddenly changes on the day a teacher named Stern enters the classroom. The kids begin to listen to each other, talk to one another, and work towards a common goal: a rock show at the end of the school year. But it's not just the notorious class that changes. A story about nonviolent communication based on Marshall Rosenberg and how to deal with conflicts and disputes in everyday school life.