Go behind the window displays. Behind the racks. Two personal shoppers for Manhattan's biggest department stores have written a wildly dishy novel that goes behind the dressing rooms of New York's fashion elite. At Frankel's New York, the wives of billionaires and Hollywood celebrities sip champagne while stylists and tailors cater to every whim. And one person has made it her career to help these Amex-wielding shoppers create the perfect look.