From Aubervilliers to Toulouse, Argenteuil to Champigny, Mantes-la-Jolie to Roubaix and even Molenbeek in Belgium, the latest edition of this book studies the strategies and practices of Islamist networks. It documents precisely the mesh of local spaces that, from places of worship to those of leisure and professional activity, leads to the formation of "Islamist territories" at odds with French society.