Anathem

Anathem, the latest invention by the New York Times bestselling author of Cryptonomicon and The Baroque Cycle, is a magnificent creation: a work of great scope, intelligence, and imagination that ushers readers into a recognizable — yet strangely inverted — world.Fraa Erasmas is a young avout living in the Concent of Saunt Edhar, a sanctuary for mathematicians, scientists, and philosophers, protected from the corrupting influences of the outside "saecular" world by ancient stone, honored traditions, and complex rituals. Over the centuries, cities and governments have risen and fallen beyond the concent's walls. Three times during history's darkest epochs violence born of superstition and ignorance has invaded and devastated the cloistered mathic community. Yet the avout have always managed to adapt in the wake of catastrophe, becoming out of necessity even more austere and less dependent on technology and material things.

Synopsis from Open Library.