Their e-mail correspondence -- conversations between a mother and son about topics they had rarely broached with each other — are now the basis of a new book, "The Rainbow Comes and Goes ...

THE RAINBOW COMES AND GOES (271 pp.)—Diana Cooper—Hough-ton M/Y-flin ($5). It is something to have had for a grandfather a duke who, after ringing a gold bell, was able to order his groom of ...