When two young sisters are abandoned on the doorstep of the Pietà in Venice in 1695, they enter the care of an extraordinary institution: part foundling hospital, part secular convent, and part conservatorio. The girls of the Pietà learn to love God through the medium of music, whether by playing an instrument or by singing in the weekly Masses, which draw admiring crowds to the chapel beyond the grille that prevents any of the performers being seen. And the soloists of the Pietà become stars, their talents as well-known as any opera singer’s, even though they must remain screened away. Of these two abandoned sisters, one, the playful and exuberant Chiaretta, will turn out to have a voice that wins her legions of admirers. The other, Maddalena, looks in vain for an instrument that sparks the inner core of her being. But then she discovers the violin, at around the time that the Pietà hires a young priest to help with giving lessons: a virtuoso violinist and budding composer with flaming red hair, named Antonio Vivaldi.