As ISIS seeks to expand its reach in the Middle East its territory serves as a base for training & operations for a new generation of jihadis Thousands of young people from the West primarily from Europe have travelled to join ISIS re-emerging as hardened fighters with military training & a network of international contacts Many of these have now returned to their homelands where it is feared they are planning a new series of brutal attacks Peter R Neumann here explains the phenomenon of the 'new jihadis' & shows why the threat of terrorism in the West is greater than ever before Based on interviews & previously-unseen material Neumann provides an essential introduction to one of the greatest crises of our time