Inferno: (Robert Langdon Book 4)

palace.
    “This way!” Mirsat called, leading them across the darkened park. The mountain of Hagia Sophia was behind them now, and the fairy-tale spires of the Blue Mosque glistened ahead.
    Hurrying beside Sinskey, Agent Brüder was shouting into his phone, updating the SRS team and ordering them to rendezvous at the cistern’s entrance. “It sounds like Zobrist is targeting the city’s water supply,” Brüder said, breathless. “I’m going to need schematics of all conduits in and out of the cistern. We’ll run full isolation and containment protocols. We’ll need physical and chemical barriers along with vacuum—”
    “Wait,” Mirsat called over to him. “You misunderstood me. The cistern is not the city water supply. Not anymore!”
    Brüder lowered his phone, glaring at their guide. “What?”
    “In ancient times, the cistern held the water supply,” Mirsat clarified. “But no longer. We modernized.”
    Brüder came to a stop under a sheltering tree, and everyone halted with him.
    “Mirsat,” Sinskey said, “you’re sure that nobody drinks the water out of the cistern?”
    “Heavens no,” Mirsat said. “The water pretty much just sits there … eventually filtering down into the earth.”
    Sinskey, Langdon, and Brüder all exchanged uncertain looks. Sinskeydidn’t know whether to feel relieved or alarmed. If nobody comes in regular contact with the water, why would Zobrist choose to contaminate it?
    “When we modernized our water supply decades ago,” Mirsat explained, “the cistern fell out of use and became just a big pond in an underground room.” He shrugged. “These days it’s nothing more than a tourist attraction.”
    Sinskey spun toward Mirsat. A tourist attraction? “Hold on … people can go down there? Into the cistern?”
    “Of course,” he said. “Many thousands visit every day. The cavern is quite striking. There are boardwalks over the water … and even a small café. There’s limited ventilation, so the air is quite stuffy and humid, but it’s still very popular.”
    Sinskey’s eyes locked on Brüder, and she could tell that she and the trained SRS agent were picturing the same thing—a dark, humid cavern filled with stagnant water in which a pathogen was incubating. Completing the nightmare was the presence of boardwalks over which tourists moved all day long, just above the water’s surface.
    “He created a bioaerosol,” Brüder declared.
    Sinskey nodded, slumping.
    “Meaning?” Langdon demanded.
    “Meaning,” Brüder replied, “that it can go airborne .”
    Langdon fell silent, and Sinskey could see that he was now grasping the potential magnitude of this crisis.
    An airborne pathogen had been on Sinskey’s mind as a possible scenario for some time, and yet when she believed that the cistern was the city’s water supply, she had hoped maybe this meant that Zobrist had chosen a water-bound bioform. Water-dwelling bacteria were robust and weather-resistant, but they were also slow to propagate.
    Airborne pathogens spread fast.
    Very fast.
    “If it’s airborne,” Brüder said, “it’s probably viral.”
    A virus , Sinskey agreed. The fastest-spreading pathogen Zobrist could choose.
    Releasing an airborne virus underwater was admittedly unusual, and yet there were many life-forms that incubated in liquid and then hatched into the air—mosquitoes, mold spores, the bacterium that caused Legionnaires’ disease, mycotoxins, red tide, even human beings. Sinskey grimly pictured the virus permeating the cistern’s lagoon … and then the infected microdroplets rising into the damp air.
    Mirsat was now staring across a traffic-jammed street with a look ofapprehension on his face. Sinskey followed his gaze to a squat, red-and-white brick building whose single door was open, revealing what looked to be a stairwell. A scattering of well-dressed people seemed to be waiting outside under umbrellas while a doorman controlled the flow of guests who were descending the stairs.
    Some kind of underground dance club?
    Sinskey saw the gold lettering on the building and felt a sudden tightness in her chest. Unless this club was called the Cistern and had been built in A.D. 523, she realized why Mirsat was looking so concerned.
    “The sunken palace,” Mirsat stammered. “It seems … there is a concert tonight.”
    Sinskey was incredulous. “A concert in a cistern?!”
    “It’s a large indoor space,” he replied. “It is often used as a cultural