This sweeping history of the development of professional, institutionalized intelligence examines the implications of the fall of the state monopoly on espionage today and beyond. During the Cold War, only the alliances clustered around the two superpowers maintained viable intelligence endeavors, whereas a century ago, many states could aspire to be competitive at these dark arts. Today, larger states have lost their monopoly on intelligence skills and capabilities as technological and sociopolitical changes have made it possible for private organizations and even individuals to unearth secrets and influence global events. Historian Michael Warner addresses the birth of professional intelligence in Europe at the beginning of the twentieth century and the subsequent rise of US intelligence during the Cold War. He brings this history up to the present day as intelligence agencies used the struggle against terrorism and the digital revolution to improve capabilities in the 2000s. Throughout, the book examines how states and other entities use intelligence to create, exploit, and protect secret advantages against others, and emphasizes how technological advancement and ideological competition drive intelligence, improving its techniques and creating a need for intelligence and counterintelligence activities to serve and protect policymakers and commanders. The world changes intelligence and intelligence changes the world. This sweeping history of espionage and intelligence will be a welcomed by practitioners, students, and scholars of security studies, international affairs, and intelligence, as well as general audiences interested in the evolution of espionage and technology.

A history of winning intelligence practices from the Spanish Armada to Cyberwar that offers timeless, practical lessons we ignore at our peril. According to conventional wisdom, strategic surprise and other intelligence failures are both inevitable and ultimately irrelevant because, at least in international politics and war, military muscle matters more than brains. In Decision Advantage, Jennifer E. Sims counters this argument by investigating the history of intelligence through centuries of international conflict, including the 16th Century's Spanish Armada, two US Civil War battles, the hunt for President Lincoln's assassin, and key diplomatic crises before the two World Wars. Sims dives deep into these events to show that the competitive pursuit of intelligence advantage has been a measurable, buildable, and consequential form of power that can help competitors win against otherwise stronger opponents. From these observations, the author develops a general guide to building intelligence readiness, whether for war, diplomacy, or international manhunts. Refuting arguments that intelligence is a sideshow because intentions are unknowable and predictions risky, she redefines success as gaining information advantages over an adversary, prescribes four practical pathways for gaining them, and confirms what seems to be simple common sense: smart competitors know how to learn, and the ones who learn best tend to win. Thinking of intelligence in this way, Sims argues, adds a moral character to an enterprise that is too often mired in excessive secrecy and tyrannical agendas. By "lifting the veil" on international politics, Decision Advantage shows how good intelligence can lessen the likelihood of wars of misperception and folly.