Lily Bart is a stunning beauty and an accomplished flirt, but, for whatever reason, keeps ruining her prospects for a good marriage. She's self destructive. She is also poor, and running with a wealthy crowd which exhausts her resources and puts her in debt. She has a number of unsavory business associations, which hurt her social prospects, and she finds her name connected, in rumor, to two different married men.
There are sympathetic characters in the story, like Gertie Farrish, but they are few and far between. Almost everyone in the book is unlikeable, including, for the most part, Lily. Still, by the end, I had come around to hoping things would go well with her, and I was a little disappointed when they did not, but I suppose that's part of what makes the novel fresh.