I remember reading a book years ago that I'd love to re-read. It followed the lives of three school friends who had been thrown together because the rest of their class had been killed in a bus crash on their way home from a school outing. Two of the girls had been off school that day and the other was the only survivor of the crash. The girls were called Beatrice, Joanne and (I think) Madeleine. Beatrice got married to an older man and had several children and Joanne became a univeristy lecturer.