Dan Brown's book "Angels and Demons"

Dan Brown's hero, Robert Langdon, is once again on a mission. This time, the Pope's official residence, the Vatican, is in danger because of an antidote created by a murdered scientist. A master of symbolism, he will uncover the secret of the "Brotherhood of the Enlightened," forgotten for centuries. On this challenging journey to find the antidote, he will be aided by the scientist's daughter, Vittoria Vetra.