GM   May 1st, 7.45 P.M., 2014, May Day Freedom-class cruise liner 'Supernal', just outside the mouth of the Great Bay, North Atlantic, auditorium...   The magician clicked his black suitcase shut, looking gravely at the distant sea of faces beyond the inferno coming from the floodlights. "Really, ladies and gentlemen? Despite my best efforts, are you still not sated? Do you need more? Do you need...her?" An answering roar of "Yes!"s resounded from the packed seats, the audience thrumming