Intelligence is now acknowledged as the hidden dimension to international diplomacy and national security. It is the hidden piece of the jigsaw puzzle of global relations that cements relationships, undermines alliances and topples tyrants, and after many decades of being deliberately overlooked or avoided, it is now regarded as a subject of legitimate study by academics and historians. This second edition of Historical Dictionary of International Intelligence covers its history through a chronology, an introductory essay, and an extensive bibliography. The dictionary section has over 500 cross-referenced entries on espionage techniques, categories of agents, crucial operations spies, defectors, moles, double and triple agents, and the tradecraft they apply. This book is an excellent access point for students, researchers, and anyone wanting to know more about the international intelligence.