The lobby of the Vista Del Mar Hotel at Miami Beach was spacious and cool, luxuriant with the green foliage of tropical plants. It was a wide thoroughfare through which flowed a constant stream of smartly dressed men and women. Occasionally a spurt of bright, empty laughter rose and fell quickly, punctuating the steady hum of voices. In a little alcove by the window, a woman sat smoking nervously while she looked with an anxious expression at each person who passed. Suddenly, she stubbed out her cigarette and intercepted a tall, handsome man who was heading for the outer entrance...