Oh dear. Somehow I always think of Margaret Truman as a young woman, even though intellectually I know she wasn't. Maybe it's because I remember seeing her when I was a kid. My father was a reporter for the Associated Press in Washington DC, and a member of the National Press Club. Every other year they had a "Father-Daughter Dinner" (I think they had father-son dinners the other years), and we always went. It was very exciting to get all dressed up and go out for the evening with my Dad, and the Press Club always had top-tier guests. One year President Truman was the guest, and he brought along his daughter Margaret. Very fitting, and very entertaining, too -- he played the piano and she sang. I thought it was wonderful.
She was quite a good writer, too. In addition to the mysteries, which are excellent and very popular, she wrote biographies of both her parents, and an autobiography.
Rest in peace, Margaret.