Young Polish American Sonia, whose deceased parents were famous musicians, exasperates her poverty-stricken guardian, Ivan Jandoroff, with her dreams of becoming a great violinist. When his employer, Andrew Hamilton, threatens to lower the wages at his steel mill, Ivan orders Sonia to work in the mill and then pawns her violin. Infuriated, Sonia soon learns that Andrew has purchased the instrument and visits the millionaire's home to demand its return. Upon hearing her play, Andrew offers to finance Sonia's musical education, but following her successful debut, he suggests that she offer herself to him to cancel the debt. Sonia tearfully smashes the violin and then returns to the factory, where she nurses the sick laborers through an epidemic and prevents a strike that would have ruined Andrew. Realizing his injustices to his workers and the woman he loves, Andrew promises to improve conditions at the mill and later proposes to Sonia.