The idea for Philosophy in a Time of Terror was born hours after the terrorist attacks on 9/11 and came to realization just weeks later when Giovanna Borradori sat down with Jurgen Habermas and Jacques Derrida, in separate interviews, in New York City. Guided by Borradori, Habermas and Derrida evaluated the significance of the most destructive terrorist attack ever perpetrated. The resulting book is an unprecedented encounter between two of the most influential thinkers of our age: here for the first time Habermas and Derrida overcome their antagonism and agree to appear side by side in this book. In her introduction, Borradori contends that philosophy has an invaluable contribution to make to the understanding of terrorism. Just as the traumas produced by colonialism, totalitarianism and the Holocaust wrote the history of the 20th century, the history of the 21st century is already signed by global terrorism. Each dialogue, accompanied by a critical essay, recognizes the magnitude of this upcoming challenge. Characteristically, Habermas’s dialogue is dense, compact and elegantly traditional. Derrida’s, on the other hand, takes the reader on a long, winding and unpredictable road. Yet unexpected agreements emerge between them: both have a deep suspicion of the concept of terrorism and see the need for a transition from classical international law, premised on the model of nation-states, to a new cosmopolitan order based on continental alliances. As Derrida and Habermas disassemble and reassemble what we think we know about terrorism, they break from the familiar social and political rhetoric increasingly polarized between good and evil. In this process, we watch two of the great philosophical minds at work.