The Brightest Star in the SkyShe is Britain's most successful and loved female writer. And this is her biggest paperback yet. June the first, a bright summer's evening, a Monday . . . And into the busy, bustling homes at 66 Star Street slips, unseen, a mysterious visitor. As the couples, flatmates and repentant singletons of No 66 fall in and out of love, clutch at and drop secrets, laugh, cry and simply try to live, no one suspects the visitor patiently waiting in the wings. For