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Malou is a talented pianist married to a successful impresario who manages her professional career. However, the day her mother dies, she loses her passion and joy for music. While clearing out her mother's apartment, Malou and her sister find an old recording of Chopin performed by the French pianist Sophie Costeau. The music is enchanting, and the pianist on the cover of the disc looks remarkably like Malou, who decides to find out who this mysterious woman is. Her search leads her to Metz in France. She soon learns that Sophie Costeau was her grandmother, who died during the Second World War and was rumoured to have worked for the Germans during the occupation of Metz. Malou is devastated by this information, but she wants to go all the way in her search and find out the truth about Sophie and her mother's past.