At the height of the Cold War, JFK risked starting a nuclear war. Horrified by the specter of nuclear annihilation, he gradually turned away from his long-held Cold Warrior beliefs and toward a policy of lasting peace. But to military and intelligence agencies in the United States, who were committed to winning the Cold War at any cost, Kennedy's change of heart was a direct threat to their power and influence. Once these dark "unspeakable" forces...