This chapter introduces a book about bribery. More precisely, the book is about how people think about offering or accepting a bribe. Bribery is an iteration of corruption, and corruption shapes the modern world. Some governments exist because of it, some will collapse under its weight. Corruption mobilizes the protests and motivates the opposition of millions, while millions more suffer its inequities. Corruption distorts the flow of the world’s resources and its capital, and renders markets dysfunctional. It is virtually impossible to turn to a news outlet without encountering stories of corruption or popular reaction to corruption. It certainly is impossible to understand the world today without taking corruption into account. This book offers a new way to think about bribery. This book explores the fundamental question of why individuals offer or accept bribes. The book approaches this question from the perspective of recent scholarship in multiple disciplines, including cognitive neuroscience, behavioral ethics, and psychology. Much of the research that has been conducted on bribery investigates the antecedent conditions of bribery in a particular country or culture, the nature and forms of bribery, and the impact of bribery on a country’s economy. Very little research looks at bribery from the point of view of the individual faced with the decision to bribe. This book starts to fill that gap.