Afterwards, the Hassassin kills Olivetti and kidnaps Vittoria, but Langdon journeys to save her. It seems that the assassin has sexual feelings to attractive females including a prostitute and Vittoria. During a scuffle with the Hassassin, Langdon figures that Janus, the Illuminati leader, disguised, is coming to brand the camerlengo with a fifth brand. When Langdon is about to lose the fight, Vittoria escapes and attacks the Hassassin. With Langdon's help they manage to throw him from the towers balcony, killing him. Maximillian Kohler is revealed to be the 11th hour Samaritan, also an anti-Catholic. Langdon strongly believes that Kohler is Janus, on a suicide mission to kill the camerlengo.Langdon and Vittoria arrive in time to save the camerlengo, who has been branded with the Illuminati Diamond, an ambigram that shows the names of all the elements written together in a perfect square. When the door is forced open during the meeting, it is seen that Kohler is brandishing a pistol at the camerlengo. The Swiss Guard shoots Kohler and Captain Rocher is also killed by Lieutenant Chartrand, after the camerlengo calls the Captain an Illuminatus. Kohler gives Langdon a camcorder, telling him to give it to the media. Langdon puts it in his pocket, but doesn't intend to give it out as he believes it is a message preaching the good of science and the evils of religion. As the camerlengo is transported to the hospital, he suddenly seems to receive a message from God, telling him where the antimatter is. He discovers it upon St. Peter's real tomb, and, accompanied by Langdon, rushes the antimatter to a helicopter, in hopes of getting it high enough to avoid damaging the Vatican. They succeed, and the camerlengo jumps out of the helicopter, landing safely at the Vatican using a parachute, which leads people to believe in this as a "miracle". This causes everyone, including the remaining cardinals, to cheer and call out the carmelengo's name.Meanwhile, Robert Langdon also escapes and lands in the Tiber River near Tiberina Island, which is famous for its reputation as an island blessed with miracles of healing. One of the nurses reveals that the camcorder given to Langdon by Kohler is continuously playing the same message over and over again, and it seems it was not a sermon about science and religion, but a revelation about Janus, Kohler, and the camerlengo. Langdon is so incensed by this that he boards a helicopter which takes him straight to the Vatican, where he plays the camcorder. It is then that it is finally revealed that the camerlengo was Janus — he tricked the Hassassin into believing the Illuminati were still active, and the brands he used were confiscated and hidden deep inside the Vatican long ago. Kohler had contacted Rocher and told him the truth about the camerlengo, allowing Kohler to meet with the camerlengo alone, with a pistol in his wheelchair.
In the diary of Leonardo Vetra, it is said that Vetra met with the camerlengo, the only other person who knew about Vetra's discovery before he was murdered.Kohler, through use of psychology, gets the camerlengo to admit to hiring the Hassassin to murder Vetra. Kohler says then that there is no escape after the camerlengo had admitted to his sin, but the camerlengo laughs and simply says, "Confessing your sins is the escape." He then brands himself with the Illuminati Diamond, screaming with pain, alerting the Swiss Guards, who kill Kohler. After being shown this, everyone in the Sistine Chapel is struck dumb, and Cardinal Mortati realizes that it means the camerlengo had murdered the Pope. The camerlengo responds to this by calling the Pope "a vile liar" before telling everybody that the Pope had fathered a child and had broken his vow of chastity. Mortati responds by revealing that although the Pope had loved a woman, he had not broken any vow as his child was born through artificial insemination. Then the final revelation comes — the Pope's child is none other than Cago Carlo Ventresca. Struck dumb with the horrifying implications of this, the camerlengo flees and eventually commits suicide on the balcony by immolating himself. His ashes are collected by Mortati and laid to rest in the Pope's sarcophagus. Mortati turns out to be eligible for the papal election and is voted to be the new Pope. To the amazement of other, however, it is revealed by a British news reporter that two Popes
had been elected instead of one. According to law, the Pope was chosen by unanimous decision by the cardinals and any servant of the church (not just cardinals) were eligible for election. When the cardinals shouted out the camerlengo's name, they unknowingly elected him Pope. Many people debate whether the ending to this story is actually ethical or not.Langdon and Vittoria then stay at the Hotel Bernini
. Lieutenant Chartrand delivers a letter and package to Langdon from the new Pope, Mortati himself. The package is the Illuminati Diamond brand, which is loaned indefinitely to Langdon.