Throughout her life Sybil Van Antwerp has used letters to make sense of the world and her place in it. Most mornings around half past ten Sybil sits down to write letters--to her brother, to her best friend, to the president of the university who will not allow her to audit a class she desperately wants to take, to Joan Didion and Larry McMurtry to tell them what she thinks of their latest books, and to one person to whom she writes often yet never...