Short, epistolary, and absolutely ruthless.

This was super fun. Lady Susan was evil, and a highly entertaining main character. Epistolary format is always so effortless to read. It might have been more fun if Mrs. Vernon had engaged in warfare against Lady Susan rather than trusting to fate to rescue her brother and Frederica from her clutches, but alas. When good people are dealing with evil people, it's sometimes not an even playing field.

Regardless, it made me LAUGH when Reginald's mother writes to Mrs. Vernon saying re: Reginald breaking off his engagement to Lady Susan, "This is the most joyful hour he has ever given us since the day of his birth." LOL. Sad. Many such cases.