Carla Nowak (29), a young PE and math teacher, started her first job in a grammar school. Carla stands out among the new employees because of her idealism. However, a series of unsolved thefts have affected the mood of faculty and staff. When a Turkish student was suspected and brought before a strict headmistress in an undignified situation, Carla decided to find out the truth. With the help of a hidden camera, she convicted the thief: to her surprise, the college's inconspicuous secretary, Friederike Kuhn, 47, seemed to be behind it. But the discovery of the crime left Carla in an insurmountable dilemma: Friederike Kuhn is also the mother of 13-year-old Oskar Kuhn and Carla's most talented student. As a result, Carla is increasingly out of control of the situation. On the one hand, she was left alone in the college. On the other hand, Kara is responsible for the psychological burden of Oscar, who is now the "son of a thief" in the eyes of children. Educational institutions have a simple solution to this situation.