The detective story, focused on inquiries, and in its wake the spy novel, built around conspiracies, developed as genres in the late nineteenth and early twentieth centuries. During the same period, psychiatry was inventing paranoia, sociology was devising new forms of causality to explain the social lives of individuals and groups and political science was shifting the problematics of paranoia from the psychic to the social realm and seeking to explain historical events in terms of conspiracy theories. In each instance, social reality was cast into doubt. We owe the project of organizing and...