Christoph Reuter is one of the world’s most important investigative journalists. His dispatches for Der Spiegel have illuminated many of the otherwise murky details of conflicts around the Middle East and South-Central Asia. Recently he may have written his most important story yet when he came into possession of the initial planning documents for the organisation that we now know as the “Islamic State”. Here is joins Petra Stienen in conversation at the Heinrich Böll Foundation to discuss the groups origins, which he writes about in detail in his recent book Die Schwarz Macht. (The interview in English starts at 24:10).