Who is Rosa Kleb? And if she is, what was she doing in East Berlin when the Campbell-Bannerman cabinet fell? For answers to these and other convoluted mysteries of the netherworld of fan Fleming, John Le Carre, and others, observe the following first published work of Mr. Campbell, a young Californian who lived in Germany when his father was Presiding District Judge in the High Commission Courts for Germany. He studied at Harvard and Berkeley, served as a Foreign Service officer in Bonn and Washington, is now a U.S. consul and economic officer in Ethiopia.