The book describes how Robert Langdon, Professor of symbology at Harvard and the main character of this book, with the help of Vettoria Vetra(an Italian scientiest and the other main character of the book) are able to save Vatican from a deadly conspiracy. Robert Langdon uses his knowledge of symbology to prevent Vatican from a certain annihilation.
In this novel I particularly liked the description of the medieval age monuments of Rome and Vatican.
This book is a must read for suspense lovers. :)