Grace Langdon, a society belle, provoked by unintentional neglect of her fiancé, Doctor Park, a busy physician, breaks her engagement and the lovers separate. Later, Grace's father loses his fortune and Grace, determined to earn a livelihood and to be useful to the world, joins the Visiting Nurses' Association. Succeeding scenes show Grace and some of her poor patients in the ghetto and show districts of the great city, where extreme poverty crushes the lives of the people to whom the visiting nurse is truly an angel of mercy. Among her charges, Grace finds a hair-worker, a consumptive, and his daughter, a pretty girl. The nurse places the father in a sanitarium and secures a position for the girl, who is rescued from his clutches by Grace. We next see a widowed mother leaving her seven children to go to work in a factory. Grace enters and finding the small baby very ill, she goes out for a physician. "Fat" Terry attacks the nurse and she is rescued by Doctor Park, her former fiancé. The doctor treats the baby and then he and Grace decide to join their lives and work together.