Obviously any fiction is going to be a combination of what is invented, what is overheard, what is experienced, what is experienced by people close to you, what you are told, what you have read, all mixed together into this kind of soup which, like any good soup, at the end you cannot really disting
“I found that our Soviet espionage efforts had virtually never, or had very seldom, produced any worthwhile political or economic intelligence on the Soviet Union.”