After his family moves from Potsdam to East Berlin, 15-year-old Klaus initially has difficulties at his new school, especially with the popular Heinz. With the help of class teacher Magnus, Klaus and Heinz settle their differences and become friends. When Magnus dies unexpectedly, his class is taken over by young Anne Morgenstern. Klaus and other classmates manage to overcome their initial dislike of the young teacher, but Heinz remains steadfast in his rejection and tries to force her replacement.