254 B OOK R EVIEWS FRUM, D. (2017): How to Build an Autocracy. The Atlantic, March 2017 issue, availa- ble at: https://www.theatlantic.com/magazine/archive/2017/03/how-to-build-an- autocracy/513872/. ROSANVALLON, P. (2011): Penser le populisme. Available at: http://www.laviedesidees.fr/Penser-le-populisme.html. Olivier Roy, Allard Tamminga and Malte Willer (eds.): Deontic Logic and Normative Systems: 13th International Conference, DEON 2016, Bayreuth, Germany, July 18-21, 2016 College Publications, Milton Keynes, 2016, 302 pages 1 Deontic logic enjoys increasing popularity. First and foremost, there are the biennial DEON conferences dedicated to deontic logic and related topics (since 1991). Moreover, Handbook of Deontic Logic and Normative Systems came into existence in 2013. The crucial importance of this publication for further rise of deontic logic is beyond question. But let us move three years forward. The 13 th DEON conference took place in Bayreuth (Germany) on July 18-21, 2016. The reviewed book contains the proceedings of this conference. Interestingly enough, the special focus was “Reasons, Argumentation and Justification”. The clever choice of special focus has led to an interesting cooperation between argumentation theory and deontic logic. The conference had four keynote speakers, namely John Broome, Janice Dowell, Xavier Parent, and Gabriella Pigozzi. The book contains eighteen interesting and original papers that are usually structured as follows: first, the authors introduce their topic, provide us with some background and some motivations for developing a new logical system, or a couple of them. Second, syntax, semantics and some inferential machinery are introduced. The effectivity and the problem-solving potential of the systems are usually demonstrated in passing. Next, the formal properties of the systems are proved, or at least mentioned. Finally, the papers conclude the achieved results, providing us 1  Daniela Glavaničová Department of Logic and Methodology of Sciences, Faculty of Arts Comenius University in Bratislava Gondova 2, 814 99 Bratislava, Slovakia e-mail: dada.baudelaire@gmail.com