This book is dedicated to my partner, Matthew Worsnick, without whom I would never have had the courage or wherewithal to travel to a dozen archives in five countries over the past ten years, pregnant, with dog, with dog and infant, with toddler and infant, with toddler and preschooler, and so on. As my editor, Matthew has revised some of the best lines of this book; as my champion, he not only enabled me, but encouraged me to undertake a re- search project that he knew was a labor of love. Through our annual research pilgrimages, our two curious sons, Thomas and Samuel, came to believe that mothers and fathers are scholars, and that historians have great adventures hunting for remote mountainside monasteries, abandoned forts, and secret caves where Tito may have hidden during World War II. They have lived this book since they were in the womb, and they have rarely called into question why their lives are not quite like those of their friends (except once, when they were 5 and 7 years old, as we were crossing the Serbia-Bosnia border by foot because I inadvertently hired an illegal taxi and we were denied entry at the border. As they rolled their little suitcases for a mile, hunched over with heavy backpacks filled with Pokémon cards and Legos, they asked whether next year they might go to summer camp instead). My debt to this incredible family is immeasurable.