As the title indicates, this film is about the composer's talented elder sibling, Maria Anna, known as Nannerl. Filmmaker René Féret takes imaginative license that allows for a considerable bit of invention while still staying grounded in the reality of the period and the story's actual outcome. The director's daughter Marie Féret plays the lead role (she's pleasant and intelligent, but perhaps a bit opaque), but the show-stopping performance comes courtesy of little sister Lisa Féret, as Louise de France, the desperately lonely yet dignified 13-year-old daughter of Louis XV.
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Filmmaker René Féret doesn't massage what we know about how Nannerl's talents were allowed to wither, purely on account of her gender, in order to create a comforting narrative.