The Sun Also Rises
Brett is everyone’s romantic interest. All of the men in the novel are attracted to her, whether or not they act on their attraction. Her mere presence (that of a seductive and irresistible woman in the midst of an otherwise all male crowd) creates conflict and jealousy wherever she goes, and the novel’s action is set into motion by her arrival. If you strip away all of the external drama of the book, the driving force of the plot is really who Brett will and won’t (or can and can’t) sleep with.