I read this book on and off for months, intercalating with shorter texts on some subject matters it also addresses. Some of those texts were referred to in the book. Just for this reason the book accomplishes its main objective, which is do a "tour d'horizon" of International Security Studies (ISS) and outline different arguments, present fields of research and suggest bibliography to further reading. Two interrelated aspects make me give four stars, in fact I think it deserves 3 1/2 stars rather than 4. One is the perhaps excessive weight it gives to Western Europe as a security actor in the world. Western Europe, be it the EU or specific countries such as Germany, UK or France, has been for more than a decade now shying of playing a bolder role in the international security agenda. At the same time, I acknowledge that European academic institutions still undertake a lot of research on security issues. This is also to say that I missed a more comprehensive analysis of Russia, both government and academia, in ISS. The same applies to China and India for that matter. The other aspect I would mention is the, in my view, excessive importance the authors give to 9/11 as a game-changer in ISS. Their analysis of the event and of the so called global war on terrorism overlooks the impact of other significant international events or crises, particularly in Africa and in the Middle East, in ISS. No matter how overwhelming 9/11 was and despite its multifaceted consequences, in 2016, its weight to ISS should be reassessed. Something that could be done perhaps in an updated edition of the book.