FOR close to a year now, Narasimha Rao has been living like a recluse. Nopress conferences. No interviews. No public meetings. The former prime ministerhas been devoting much of every working day in an intellectual exercise that,his friends point out, gives him greater pleasure than the petty politics of theCongress. Rao has been giving the final touches to the first volume of thetwo-part novel that he is writing for Penguin Books.