At Prague’s eerie Dripstone Wall in Wallenstein Garden, Ambassador Nagel waits calmly, reflecting on pareidolia and on how Everett Finch’s ruthlessness served a larger CIA mission. Robert Langdon and Katherine Solomon arrive, and Nagel—accompanied by her security aide, Scott Kerble—leads them to a tiny locked door hidden at the base of the wall.

The door opens into the old St. Thomas Monastery complex, now repurposed as the Augustine Luxury hotel. Nagel quietly escorts them through back corridors to the hotel spa, choosing it because the staff are trusted and the rooms are soundproofed. She secures a private, windowless lounge while Kerble goes to find food.

Nagel announces “very good news”: they now possess the incriminating evidence they wanted about Threshold. She explains that Sasha Vesna’s “guardian angel” sent her a handwritten plea—“PLEASE HELP SASHA”—including a URL that links to a brutal video confession by Dr. Gessner. In the video, Gessner details Threshold’s human testing, brain surgeries, implants, drugs, near-death experiments, and the people involved.

Nagel says she has safeguarded the confession and will make backups, calling it Langdon and Solomon’s “atomic bomb” that should prevent the CIA from ever pursuing them again. She argues the CIA director may not have known the full scope because Finch controlled information, and she admits lasting guilt over coercing Michael Harris into spying on Sasha—an assignment that cost Harris his life.

Turning to the identity of Sasha’s protector, Nagel says the torturer in the video spoke with a Russian accent and seemed personally betrayed, as if he had been a Threshold subject. She shares that the director identified Threshold’s first subject as a Russian taken from the same institution as Sasha—Dmitri Sysevich—whose death Finch claimed but could not prove. Nagel concludes Dmitri may have survived and returned for revenge, but Langdon stops her and tells her directly that the person who killed Gessner was not Dmitri Sysevich.