The introduction sets out the intent of the book, an overview of the major works in the field, and a view of the arguments appearing in each chapter. Gambling is central to the cultural, social, and intellectual history of the nineteenth century. Studying casino gambling provides a way to see how nineteenth-century Europeans understood their changing world, even as it also reflected those changes itself. In this way gambling was used in an explanatory capacity, one that let contemporaries probe the inner workings of the machine and the creation of knowledge. If we want to understand the intricate dance of society, culture, politics, and ideas, then gambling is a useful tool to pry open these different stories, allowing us to see better large historical transformations.