In the stockyards and commercial exchanges of modern Chicago, Salvation Army girl Joan Dark imagines that the meat-packer king Piermont Mauler is going to save the falling market and prevent unemployment. She helps the workers to organise a general strike, and Mauler is persuaded to lead the meat ring out of its troubles. Johanna, desperately ill, is canonised by Mauler for her work among the poor, and she vainly denounces the class system as she dies.