Carole Radziwill's vivid and haunting <I>New York Times</i> bestseller begins with loss and returns to loss. A summer that was meant to bring four friends together in the final weeks of her husband Anthony's life brought instead the kind of tragedy that breaks into ordinary days in a heartbeat, when the small plane carrying Anthony's cousin John Kennedy Jr. and Carolyn Bessette, <P> Carole's best friend, plunged into the ocean. This is the story of a life that has so far been nothing short of extraordinary -- an upstate New York girl who became an ABC news producer who married a Polish prince. <I>What Remains</i> will leave an indelible mark on all who glimpse life's greatest joys and deepest pain in its pages.