For four explosive years Pep Guardiola's Barcelona produced the greatest football in history, seducing fans around the world. In this exclusive, first-hand account of events between 2008 and 2012, the players themselves reveal the tension of the bitter Mourinho-Guardiola rivalry, the emotion of Abidal's fight against cancer to lift the European Cup and how Messi, the best footballer in the world, nearly didn't make it.