Diana touched your elbow, your arm, covered your hand with hers. It was alluring. And she was disarmingly confiding. "Can I ask you something? Nicholas, please be frank . . ." Over his 30-year career at Cond Nast, Nicholas Coleridge has witnessed it all. From the anxieties of the Princess of Wales to the blazing fury of Mohamed Al-Fayed, his story is also the story of the people who populate the glamorous world of glossy magazines. With...