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Langdon and Vittoria hurry through the deserted Vatican toward the Secret Vatican Archives. Vittoria asks what Langdon expects to find, and Langdon explains that he is searching for a small work by Galileo that may contain il segno, a sign or clue to a secret Illuminati location in Rome.

Langdon explains that Galileo’s Illuminati, originally a brotherhood of persecuted scientists rather than satanists, needed a way to guide worthy recruits to their hidden meeting place, the Church of Illumination, without exposing the location to the Vatican. The solution was the Path of Illumination: a concealed trail of symbolic markers hidden in public Roman locations.

Langdon tells Vittoria that the markers were works of religious-looking art, created by an anonymous Illuminati artist and placed in selected churches. Each sculpture represented one of the four classical elements of science—Earth, Air, Fire, and Water—and each pointed toward the next church on the path until the initiate reached the hidden sanctuary.

Vittoria realizes the importance of the phrase altars of science: the assassin’s threat to sacrifice the four kidnapped cardinals on the altars of science likely refers to those four churches. Langdon believes each preferito will be killed at a different marker church, making the old Path of Illumination the key to predicting the murders.

Langdon privately connects this revelation to the assassin’s promise to brand each cardinal with a different symbol. He sees the modern Illuminati plot as a deliberate public unveiling of ancient secrets, using the murders and antimatter threat as a theatrical declaration of power.

At the archive entrance, a Swiss Guard reluctantly admits Langdon and Vittoria after confirming the camerlegno’s order. The guard escorts them through multiple security barriers, opens the final doors, and leaves because even Swiss Guards are not cleared for the Secret Archives, leaving Langdon and Vittoria to enter alone.