Historians and political scientists alike should appreciate Dan Reiter’s How Wars End. It eschews statistical analysis for comparative case-studies because the answers are “complex and nuanced” (6) and defers formal proofs for plain-language explanations. The six empirical chapters are based on case-specific puzzles rather than theory-driven questions. The three reviewers—Dale Copeland, Hein Goemans, and Zachary Shirkey—find few major flaws with How Wars End, although each has some reservations over aspects of the argument. Because some readers might not be versed in rationalist theories on war that Reiter engages, this introduction will first provide an overview of them and then discuss the reviews in the next section.