Two French specialists on Islam, one Algerian, the other a native Frenchman, discuss Islam and its confrontation with the Western world. Interweaving references to the past and present, they recount a long history of cultural confrontation, marked by continuous debate and violent conflict, repulsion and fascination. Resolutely optimistic, yet painfully aware of the religious intransigence which enshrouds their subject, their conversations shed new light on the conceptions of power and unity within the Muslim world.