My friend Rob is a sleuth, a C.I.A. man (graduate of the Culinary Institute of America). Having been both a cook and manager in many high -end culinary spots in the capital, he knows secrets - the kind that restaurant critics don't usually see or write about. Sexism, racism - all the isms at work under pressure backstage where the public is never invited. The beefy Southern Senator who backs a black waitress against the wall for a tryst after dessert in the Senate dining room for instance: whoever sees that?. The same Senator asking that none of his food be 'touched by the niggers in the kitchen.' Mr. Big more or less controlled my friend's job so should my friend have interfered, talked back, rescued his colleague?