Seldom has the weight of politics descended so heavily on such a tiny and unprepared nation. And seldom has the hidden eye of the British Intelligence selected such an unlikely champion as Harry Pendel - a charmer, a dreamer, an evader, a fabulist and presiding genius to the house of Pendel & Braithwaite Co. Limitada, Tailors to Royalty, formerly of London and presently of Panama City. Yet there is a logic to the spies' choice, for everybody who is anybody in Cental America passes through Pendel's door