L'ombra del gigante (2000)

Roberto Petrocchi directs this period drama set in the late 1800s. Capt. Eugenio (Arnaud Arbessier) arrives in a remote castle to take charge of a unit guarding a nameless prisoner. No one knows much about the inmate as he is held in a forlorn tower. When the captain's wife Adele (Margherita Buy) tries to shake her melancholia by playing the piano, she finds -- much to her surprise -- that she's being accompanied by violin music coming from the prison cell. Soon something in Adele changes abruptly and irreversibly. The woman is indeed captured by the music and by responding with her piano to the violin melody, she participates in the awakened relationship between the prisoner and the outside world...