One anonymous football fan. 18.6 million confidential documents. This is the explosive story of the biggest leak in sporting history - and the shady underworld of modern football. In 2016, a whistle-blower known only as 'John' started to leak a treasure trove of top-secret files to German newspaper Der Spiegel. These documents reveal the clandestine dealings of clubs, players and agents at the highest echelons of international...