Opera singer Mary Barrett (Grace Moore) leaves to study music in Milan, Italy to the disappointment of her family in New York City. Mary gets a job at the Cafe Roma, where Giulio Monteverdi (Tullio Carminati), a famous vocal coach, hears her sing. Giulio promises to make Mary a star if she will allow him to control her life. He also tells her that there cannot be any romance between the two of them, as that would distract from the process of growing her talent. Mary discovers she has stagefright as she prepares for a tour of provincial opera houses, however Giulio helps her overcome it.