It all starts with the death of Martijn van Vliet's wife. His grief-stricken young daughter, Lea, cuts herself off from the world, right up until the day that she hears a snatch of Bach being played on a violin by a busker. Transfixed by the sweet melody, she emerges from her mourning, vowing to learn the instrument. Lea's all-consuming passion is matched by talent, and she becomes one of the finest players in the country - but as her fame blossoms, her relationship with her father only withers.