peaceful from here, a far cry, Langdon imagined, from what was probably transpiring at the cistern. By now, he suspected, Sinskey and the SRS team had realized that they had arrived too late to stop the plague.
Beside him, Sienna stared out across the sea. “I don’t have much time, Robert,” she said. “The authorities will eventually figure out where I went. But before they do, I need you to hear the truth … all of it.”
Langdon gave her a silent nod.
Sienna wiped her eyes and shifted on the bench to face him fully. “Bertrand Zobrist …” she began. “He was my first love. He became my mentor.”
“I’ve already been told, Sienna,” Langdon said.
She gave him a startled look but continued speaking, as if afraid to lose her momentum. “I met him at an impressionable age, and his ideas and intellect bewitched me. Bertrand believed, as I do, that our species is on the brink of collapse … that we’re facing a horrifying end, which is racing toward us so much faster than anyone dares accept.”
Langdon made no reply.
“My entire childhood,” Sienna said, “I wanted to save the world. And all I was ever told was: ‘You can’t save the world, so don’t sacrifice your happiness trying.’ ” She paused, her face taut, holding back tears. “Then I met Bertrand—a beautiful, brilliant man who told me not only that saving the world was possible … but that doing so was a moral imperative. He introduced me to an entire circle of like-minded individuals—people of staggering abilities and intellect … people who really could change the future. For the first time in my life, I no longer felt all alone, Robert.”
Langdon offered a soft smile, sensing the pain in her words.
“I’ve endured some terrible things in my life,” Sienna continued, her voice increasingly unsteady. “Things I’ve had trouble moving past …” She broke his gaze and ran an anxious palm across her bald scalp before collecting herself and turning back to him. “And maybe that’s why the only thing that keeps me going is my belief that we are capable of being better than we are … capable of taking action to avoid a catastrophic future.”
“And Bertrand believed that, too?” Langdon asked.
“Absolutely. Bertrand had boundless hope for humankind. He was a Transhumanist who believed we are living on the threshold of a glittering ‘posthuman’ age—an era of true transformation. He had the mind of a futurist, eyes that could see down the road in ways few others could even imagine. He understood the astonishing powers of technology and believed that in the span of several generations, our species would become a different animal entirely—genetically enhanced to be healthier, smarter, stronger, even more compassionate.” She paused. “Except for one problem. He didn’t think we’d live long enough as a species to realize that possibility.”
“Due to overpopulation …” Langdon said.
She nodded. “The Malthusian catastrophe. Bertrand used to tell me he felt like St. George trying to slay the chthonic monster.”
Langdon didn’t follow her meaning. “Medusa?”
“Metaphorically, yes. Medusa and the entire class of chthonic deities live underground because they’re associated directly with Mother Earth. In allegory, chthonics are always symbols of—”
“Fertility,” Langdon said, startled that the parallel had not occurred to him earlier. Fruitfulness. Population.
“Yes, fertility,” Sienna replied. “Bertrand used the term ‘chthonic monster’ to represent the ominous threat of our own fecundity. He described our overproduction of offspring as a monster looming on the horizon … a monster we needed to contain immediately, before it consumed us all.”
Our own virility stalks us, Langdon realized. The chthonic monster. “And Bertrand battled this monster … how?”
“Please understand,” she said defensively, “these are not easy problems to solve. Triage is always a messy process. A man who severs the leg of a three-year-old child is a horrific criminal … until that man is a doctor who saves the child from gangrene. Sometimes the only choice is the lesser of two evils.” She began tearing up again. “I believe Bertrand had a noble goal … but his methods …” She looked away, on the verge of breaking down.
“Sienna,” Langdon whispered gently. “I need to understand all of this. I need you to explain to me what Bertrand did. What did he release into the world?”
Sienna faced him again, her soft brown eyes radiating a darker fear. “He released a virus,” she whispered. “A very specific kind of virus.”
Langdon held his breath. “Tell me.”
“Bertrand created something known as a viral vector. It’s a virus intentionally designed to install genetic