After the release of the world bestseller The Name of the Rose (1980), famous for the famous film, the Italian historian, aestheticist, structuralist Umberto Eco found himself in a difficult position. How to take such a height for the second time? How to write an equally successful book for different readers, both erudite and unsophisticated? The book is as lively as it is wise, as sardonic as it is tender? The author took a risk - and confirmed the previous record. Foucault's Pendulum (1988) became famous no less than The Name of the Rose, and the film on it was not shot only because the author himself did not allow this to the great Stanley Kubrick. On these pages interact editors of Milanese publishing house, knights-templars, voodoo priests and anti-fascist partisans. It is told about the legendary Templars, about the secret masters of the world, but only to remind: history is reliable when its basis is an indisputable document. Everything else is a game. A game that can be dangerous.