Schubert, Mozart, Chopin and a bunch of killers. That's life for 80-year-old piano teacher Traude Krueger. The old lady has been teaching music at the women's prison for ages. But she has never met an inmate like Jenny: a killer who beats everything around her to a pulp just to amuse herself. However, she used to be a great talent. A piano prodigy even. And beneath her fierce facade, she still is. With Traude's help, she could manage to win a prestigious piano contest. But a contest is no challenge to those who want their lives to stand still.