This short treatise offers an overview of one of the most controversial movements and terrorist groups of the XXI Century, analyzing the infamous ISIS from its creation to the Paris attacks of Friday, November 13th, 2015. Here, one may find a sharp analysis of the birth and the history of the Islamic State, the origin and ideology of the Wahhabi current, its geopolitical evolution from a small group of troops to a modern State, without neglecting the phenomenon of the Arab Springs. Eventually, the most important events that have recently shocked the West are examined, suggesting the idea that ,perhaps, they contain something much darker than ordinary people may have imagined.