Briony - 18 years old: Dear Cecilia, Please don't throw this away without reading it. As you'll have seen from the notepaper, I'm here at St. Thomas's, doing my nurses' training. I decided not to take up my place at Cambridge. I decided I wanted to make myself useful, do something practical. But no matter how hard I work, no matter how long the hours, I can't escape from what I did and what it meant, the full extent of which I'm only now beginning to grasp. Cee, please write and tell me we can meet. Your sister, Briony.