Scarlett O'Hara was a pip, but Mitchell was a piece of work. In this devoutly academic biography, Southern Daughter: The Life of Margaret Mitchell, Darden Asbury Pyron describes a Southern belle who took a job as a newspaperwoman at 22 but left it four years later to devote her life to a series of real and imaginary ailments. After GWTW, she never wrote another thing, except for some 10,000 letters. B