A dedicated priest sets up a mission in the slums of a great metropolitan city, hoping to clean up the community by cleansing the souls of its denizens. The plot concentrates on one of these unfortunates, a falsely accused convict played by William Collier Jr. Released from jail, Collier returns to his tenement neighborhood, seeking revenge on the man who framed him. But upon meeting mission worker Blanche Mehaffey, the ex-girlfriend of his would-be victim, Collier vows to change his ways. He also sees to it that his two ex-cellmates (Murray Smith and James Bradbury Jr., a sort of poor man's Laurel and Hardy) will likewise follow the straight and narrow.