"Lady Susan" is an epistolary novella, with correspondence amongst various members and friends of the Vernon family with regard to Lady Susan, her daughter Frederica, and the various courtship scandals of those two women.
And ... I didn't enjoy it much.
Usually I find Jane Austen's work to be filled with good-humored social commentary and interesting characters. Perhaps it was because the work was short, but I didn't find much of that here; this is occasionally the curse of short fiction. However, I really do think Austen was better than this! Not a redeeming character to be found ... just a bunch of scheming "marriage market" behavior. No wonder it took me so long to get through such a short book.