Angels and Demons by Dan Brown
Robert Langdon, a fellow symbologist, is sent to a Swiss research center to investigate a puzzling symbol that has been burned into a physicists’ chest. To his dismay, he discovers that a secret organization—the Illuminati—has resurfaced to accomplish their final task, destroying the Catholic Church.
Meanwhile, upon hearing about her father’s death, Vittoria rushes to the scene. As both Robert and Vittoria team up to investigate the physicists’ death, both learn that the assassinator has also stolen Vittoria and her father’s creation—antimater. At only one gram, antimatter is powerful enough to destroy an entire city. The news of the stolen antimatter spreads quietly and both are eager to find it before it destroys the Vatican City.
When Robert and Vittoria visit the Camerlengo, an individual who manages the pope’s affairs, inside the Vatican City, they soon receive a mysterious phone call regarding four missing cardinals. The four cardinals have been kidnapped and will be murdered one at a time at each hour by the main elements according to the Illuminati: earth, air, fire, water. Because of their absence, conclave will have to choose another pope. But because one of the four kidnapped cardinals was meant to be the next pope, conclave will be in session until a pope is chosen.
With the antimatter exploding at midnight and with the death of a pope at every hour until midnight, Vittoria and Robert race against time to save Vatican City. But as they do so, they are swept into an ancient trail of symbols created by the Illuminati. Though they are not able to save any of the cardinals, Robert does manage to kill the assassinator after completing the Illuminati trail. But to both Robert and Vittoria’s surprise, Camerlengo is behind it all.