Part I: Introduction: Networks and hierarchies ; The mystery of the Illuminati ; Our networked age ; Networks, networks everywhere ; Why hierarchies? ; From seven bridges to six degrees ; Weak ties and viral ideas ; Varieties of network ; When networks meet ; Seven insights ; The Illuminati illuminated -- Part II: Emperors and explorers. A brief history of hierarchy ; The First Networked Age ; The art of the Renaissance deal ; Discoverers ; Pizarro and the Inca ; When Gutenberg met Luther -- Part III: Letters and lodges. The economic consequences of the Reformation ; Trading ideas ; Networks of Enlightenment ; Networks of revolution -- Part IV: The restoration of hierarchy. The red and the black ; From crowd to tyranny ; Order restored ; The house of Saxe-Coburg-Gotha ; The house of Rothschild ; Industrial networks ; From pentarchy to hegemony -- Part V: Knights of the Round Table. An imperial life ; Empire ; Taiping ; 'The Chinese must go' ; The Union of South Africa ; Apostles ; Armageddon -- Part VI: Plagues and pipers. Greenmantle ; The plague ; The leader principle ; The fall of the golden international ; The ring of five ; Brief encounter ; Ella in reform school -- Part VII: Own the jungle. The long peace ; The general ; The crisis of complexity ; Henry Kissinger's network of power ; Into the valley ; The fall of the Soviet Empire ; The triumph of Davos Man ; Breaking the Bank of England -- Part VIII: The Library of Babel. 9/11/2001 ; 9/15/2008 ; The administrative state ; Web 2.0 ; Coming apart ; Tweeting the revolution ; 11/9/2016 -- Part IX: Conclusion: facing Cyberia. Metropolis ; Network outage ; FANG, BAT and EU ; The square and the tower redux -- Afterword: The original square and tower.