During the 1960s and 70s, Morocco was one of the preferred fields for research by Anglo-Saxon anthropologists seeking to study societies whose traditional structures had been affected relatively little, or not at all, by Western imperialism. The American anthropologist, Emilio Spadola, belongs to a new generation of anthropologists, that, in the 1990s and 2000s, appropriated the same well-trodden territory afresh in order, in his case, to analyse the impact of new communication technologies on the forms of piety and authority in this reserve of traditional religious practices. Emilio Spadola’s book examines the different forms of call to Islam that compete in urban parts of Morocco (in the city of Fez), and the transformations these calls have undergone from the colonial period to the present day. At the heart of this competition lies a shared belief among Moroccans in the existence of jinns, those invisible forces that may take possession of individuals, which some would like to see mastered and others would like to see eradicated. Such mastery of invisible forces confers on those who claim to possess it a certain legitimacy and religious authority in the eyes of those who accept their claims. Discourse around the jinns reveals the different forms of belonging and of the call to Islam in today’s Morocco. The field research was undertaken during a period of consolidation of State control over religious affairs after the attacks in Casablanca in 2003, a consolidation that aims to reinforce and reclaim the ‘spiritual security of the nation’ (p. 14), according to King Muhammad VI. On the ground, this control manifests itself on the one hand in a desire to recuperate and domesticate Sufi practices, and on the other in a repression of Islamist contestation; sometimes force is used, but public opinion is also manipulated thanks to the State monopoly of mass communications, especially television.