This chapter introduces the reader to the topic studied in the book, factual misinformation and its appeal in war. It poses the main research question of who believes in wartime misinformation and how people know what is happening in war. It then outlines the book’s central argument about the role of proximity and exposure to the fighting in constraining public misperceptions in conflict, and the methods and types of evidence used to test it. After clarifying some key concepts used in the book, it finally closes with a sketch of the manuscript’s main implications and an outline of its structure and contents.