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The Panama Papers tax scandal has all the elements of a spy story. A year-long investigation began when the German newspaper, the Sueddeutsche Zeitung, received information from a source, known only as John Doe. The paper shared 11.5m documents with the International Consortium of Investigative Journalists (ICIJ). The journalist in charge of the whole operation, Stefan Kornelius, tells Paul Moss how hundreds of journalists "kept quiet" about the biggest leak in history. (Photo credit: Jim Watson/AFP/Getty Images)