Simone Beaulieu, better known as Mother Augustine, runs a convent school for girls in the 1960s. She has turned the little convent into a musical treasure where the students have won every prestigious music competition in the region. When her talented but rebellious niece joins the convent and the government threatens to shut down the school in favour of public education, her world is suddenly turned upside down. She and her fellow nuns are forced to confront the waves of modernity and Mother Augustine herself must search her soul for a new calling. Can she accept her past in order to move forward? Or will she perish with tradition?