The most exciting stories about spies are those that actually happen. The fact of the betrayal of Soviet Colonel Oleg Penkovsky is not an invention of our or foreign intelligence. They wrote and talked about him in the early sixties, but many aspects of this case have long been hidden in CIA documents classified as "top secret". Today they are being made public, and the reader can independently conclude whether Penkovsky was the man who saved the world from a nuclear disaster.