The violin teacher at the Perugia Conservatory in Italy is loved by his female pupils and the rich ladies in town. Later we learn that he was a great concert soloist and had to give up his career because of his drunkard wife.

Mara, Silvia and Irene, three sisters, are sent from Rome to Padua as guests of prof. Bordignon, their uncle. First, they let off steam with the young cousin Anselmo; then, realizing that their destiny is a boarding school, they take plot their revenge.