The persistence of conspiracies. Grasping the infinity of lists. Writing fiction about the real. The future of books.These are some of the topics Umberto Eco discussed with Paul Holdengräber, Director of LIVE at the New York Public Library, when he came to the Intelligence Squared stage in November 2011. Their wide-ranging conversation focused in part on Eco's book 'The Prague Cemetery', an historical pseudo-reconstruction set in a 19th-century Europe teeming with secret service forgeries, Jesuit plots, murders and conspiracies, and covering everything from the unification of Italy, the Paris Commune, the Dreyfus Affair to The Protocols of the Elders of Zion. It has been criticised by both the Vatican-backed newspaper the Osservatore Romano and the Chief Rabbi of Rome.