Although his main purpose is a frank defense of CIA's activities and general policy, the author has also found room for a chronology of espionage and national security which takes in every spy case of importance from the deputation Moses sent into Canaan to the Profumo- Ivanov-Keeler scandal. Aside from the few autobiographical remarks, the sections which readers should find most fascinating deal with clandestine intelligence-gathering as a trade: what types of sources can be trusted, how ""plants"" are made, and all the ingenious rules of the game. There is a categorical denial of CIA interference in policy-making (i.e. the Bay of Pigs fiasco) and he warns that ""the last thing we can afford to do today is to put our intelligence in chains""...Both the Dulles' name and the material should enlist considerable attention and interest.