"Yes. Leonardo’s adopted daughter. She is also a physicist here at CERN. She and her father share a lab. They are partners. Ms. Vetra has been away this week doing field research. I have notified her of her father’s death, and she is returning as we speak."

"But a man has been murd—"

"A formal investigation," Kohler said, his voice firm, "will take place. However, it will most certainly involve a search of Vetra’s lab, a space he and his daughter hold most private. Therefore, it will wait until Ms. Vetra has arrived. I feel I owe her at least that modicum of discretion."

Kohler turned the key.

As the door swung open, a blast of icy air hissed into the hall and hit Langdon in the face. He fell back in bewilderment. He was gazing across the threshold of an alien world. The flat before him was immersed in a thick, white fog. The mist swirled in smoky vortexes around the furniture and shrouded the room in opaque haze.

"What the…?" Langdon stammered.

"Freon cooling system," Kohler replied. "I chilled the flat to preserve the body."

Langdon buttoned his tweed jacket against the cold. I’m in Oz, he thought. And I forgot my magic slippers.

The corpse on the floor before Langdon was hideous. The late Leonardo Vetra lay on his back, stripped naked, his skin bluish-gray. His neck bones were jutting out where they had been broken, and his head was twisted completely backward, pointing the wrong way. His face was out of view, pressed against the floor. The man lay in a frozen puddle of his own urine, the hair around his shriveled genitals spidered with frost.

Fighting a wave of nausea, Langdon let his eyes fall to the victim’s chest. Although Langdon had stared at the symmetrical wound a dozen times on the fax, the burn was infinitely more commanding in real life. The raised, broiled flesh was perfectly delineated… the symbol flawlessly formed.

Langdon wondered if the intense chill now raking through his body was the air-conditioning or his utter amazement with the significance of what he was now staring at.

His heart pounded as he circled the body, reading the word upside down, reaffirming the genius of the symmetry. The symbol seemed even less conceivable now that he was staring at it.

"Mr. Langdon?"

Langdon did not hear. He was in another world… his world, his element, a world where history, myth, and fact collided, flooding his senses. The gears turned.

"Mr. Langdon?" Kohler’s eyes probed expectantly.

Langdon did not look up. His disposition now intensified, his focus total. "How much do you already know?"

"Only what I had time to read on your website. The word Illuminati means ‘the enlightened ones.’ It is the name of some sort of ancient brotherhood."

Langdon nodded. "Had you heard the name before?"

"Not until I saw it branded on Mr. Vetra."

"So you ran a web search for it?"

"Yes."

"And the word returned hundreds of references, no doubt."

"Thousands," Kohler said. "Yours, however, contained references to Harvard, Oxford, a reputable publisher, as well as a list of related publications. As a scientist I have come to learn that information is only as valuable as its source. Your credentials seemed authentic."

Langdon’s eyes were still riveted on the body.

Kohler said nothing more. He simply stared, apparently waiting for Langdon to shed some light on the scene before them.

Langdon looked up, glancing around the frozen flat. "Perhaps we should discuss this in a warmer place?"

"This room is fine." Kohler seemed oblivious to the cold. "We’ll talk here."

Langdon frowned. The Illuminati history was by no means a simple one. I’ll freeze to death trying to explain it. He gazed again at the brand, feeling a renewed sense of awe.

Although accounts of the Illuminati emblem were legendary in modern symbology, no academic had ever actually seen it. Ancient documents described the symbol as an ambigram—ambi meaning "both"—signifying it was legible both ways. And although ambigrams were common in symbology—swastikas, yin yang, Jewish stars, simple crosses—the idea that a word could be crafted into an ambigram seemed utterly impossible. Modern symbologists had tried for years to forge the word "Illuminati" into a perfectly symmetrical style, but they had failed miserably. Most academics had now decided the symbol’s existence was a myth.

"So who are the Illuminati?" Kohler demanded.

Yes, Langdon thought, who indeed? He began his tale.

"Since the beginning of history," Langdon explained, "a deep rift has existed between science and religion. Outspoken scientists like Copernicus—"

"Were murdered," Kohler interjected. "Murdered by the church for revealing scientific truths. Religion has always persecuted science."

"Yes. But in the 1500s, a group of men in Rome fought back against the church. Some of Italy’s most enlightened men—physicists, mathematicians, astronomers—began meeting secretly to share their concerns about the church’s inaccurate teachings. They feared that the church’s monopoly on ‘truth’ threatened academic enlightenment around the world. They founded the world’s first scientific think tank, calling themselves ‘the enlightened ones.’ "

"The Illuminati."

"Yes," Langdon said. "Europe’s most learned minds… dedicated to the quest for scientific truth."

Kohler fell silent.

"Of course, the Illuminati were hunted ruthlessly by the Catholic Church. Only through rites of extreme secrecy did the scientists remain safe. Word spread through the academic underground, and the Illuminati brotherhood grew to include academics from all over Europe. The scientists met regularly in Rome at an ultrasecret lair they called the Church of Illumination."

Kohler coughed and shifted in his chair.

"Many of the Illuminati," Langdon continued, "wanted to combat the church’s tyranny with acts of violence, but their most revered member persuaded them against it. He was a pacifist, as well as one of history’s most famous scientists."

Langdon was certain Kohler would recognize the name. Even nonscientists were familiar with the ill-fated astronomer who had been arrested and almost executed by the church for proclaiming that the sun, and not the earth, was the center of the solar system. Although his data were incontrovertible, the astronomer was severely punished for implying that God had placed mankind somewhere other than at the center of His universe.

"His name was Galileo Galilei," Langdon said.

Kohler looked up. "Galileo?"

"Yes. Galileo was an Illuminatus. And he was also a devout Catholic. He tried to soften the church’s position on science by proclaiming that science did not undermine the existence of God, but rather reinforced it. He wrote once that when he looked through his telescope at the spinning planets, he could hear God’s voice in the music of the spheres. He held that science and religion were not enemies, but rather allies—two different languages telling the same story, a story of symmetry and balance… heaven and hell, night and day, hot and cold, God and Satan. Both science and religion rejoiced in God’s symmetry… the endless contest of light and dark." Langdon paused, stamping his feet to stay warm.

Kohler simply sat in his wheelchair and stared.

"Unfortunately," Langdon added, "the unification of science and religion was not what the church wanted."

"Of course not," Kohler interrupted. "The union would have nullified the church’s claim as the sole vessel through which man could understand God. So the church tried Galileo as a heretic, found him guilty, and put him under permanent house arrest. I am quite aware of scientific history, Mr. Langdon. But this was all centuries ago. What does it have to do with Leonardo Vetra?"