When multinational tycoon Cole Harrison approached her on a moonlit balcony at the White Orchid Charity Ball, Diana Foster had no idea how extraordinary the night ahead would be. The most lavish social event of the Houston season had brought out American aristocracy, Texas-style, in glittering array. So, after losing her fiancÔe to a blond Italian heiress and reading about it in a sleazy gossip paper, the lovely Diana felt obliged to make an appearance — if only to save face and to bolster her company's image.