The Correspondent by Virginia Evans

Sybil Van Antwerp has throughout her life 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 sends the letter. Sybil expects her world to go on as it always has—a mother, grandmother, wife, divorcee, distinguished lawyer, she has lived a very full life. But when letters from someone in her past force her to examine one of the most painful periods of her life, she realizes that the letter she has been writing over the years needs to be read and that she cannot move forward until she finds it in her heart to offer forgiveness. Goodreads