“You woke up shouting,” the woman said. “Do you remember why?”

Langdon flashed again on the strange vision of the veiled woman surrounded by writhing bodies. Seek and ye shall find. “I was having a nightmare.”

“About?”

Langdon told her.

Dr. Brooks’s expression remained neutral as she made notes on a clipboard. “Any idea what might have sparked such a frightening vision?”

Langdon probed his memory and then shook his head, which pounded in protest.

“Okay, Mr. Langdon,” she said, still writing, “a couple of routine questions for you. What day of the week is it?”

Langdon thought for a moment. “It’s Saturday. I remember earlier today walking across campus … going to an afternoon lecture series, and then … that’s pretty much the last thing I remember. Did I fall?”

“We’ll get to that. Do you know where you are?”

Langdon took his best guess. “Massachusetts General Hospital?”

Dr. Brooks made another note. “And is there someone we should call for you? Wife? Children?”

“Nobody,” Langdon replied instinctively. He had always enjoyed the solitude and independence provided him by his chosen life of bachelorhood, although he had to admit, in his current situation, he’d prefer to have a familiar face at his side. “There are some colleagues I could call, but I’m fine.”

Dr. Brooks finished writing, and the older doctor approached. Smoothing back his bushy eyebrows, he produced a small voice recorder from his pocket and showed it to Dr. Brooks. She nodded in understanding and turned back to her patient.

“Mr. Langdon, when you arrived tonight, you were mumbling something over and over.” She glanced at Dr. Marconi, who held up the digital recorder and pressed a button.

A recording began to play, and Langdon heard his own groggy voice, repeatedly muttering the same phrase: “Ve … sorry. Ve … sorry.”

“It sounds to me,” the woman said, “like you’re saying, ‘Very sorry. Very sorry.’ ”

Langdon agreed, and yet he had no recollection of it.

Dr. Brooks fixed him with a disquietingly intense stare. “Do you have any idea why you’d be saying this? Are you sorry about something?”

As Langdon probed the dark recesses of his memory, he again saw the veiled woman. She was standing on the banks of a bloodred river surrounded by bodies. The stench of death returned.

Langdon was overcome by a sudden, instinctive sense of danger … not just for himself … but for everyone. The pinging of his heart monitor accelerated rapidly. His muscles tightened, and he tried to sit up.

Dr. Brooks quickly placed a firm hand on Langdon’s sternum, forcing him back down. She shot a glance at the bearded doctor, who walked over to a nearby counter and began preparing something.

Dr. Brooks hovered over Langdon, whispering now. “Mr. Langdon, anxiety is common with brain injuries, but you need to keep your pulse rate down. No movement. No excitement. Just lie still and rest. You’ll be okay. Your memory will come back slowly.”

The doctor returned now with a syringe, which he handed to Dr. Brooks. She injected its contents into Langdon’s IV.

“Just a mild sedative to calm you down,” she explained, “and also to help with the pain.” She stood to go. “You’ll be fine, Mr. Langdon. Just sleep. If you need anything, press the button on your bedside.”

She turned out the light and departed with the bearded doctor.

In the darkness, Langdon felt the drugs washing through his system almost instantly, dragging his body back down into that deep well from which he had emerged. He fought the feeling, forcing his eyes open in the darkness of his room. He tried to sit up, but his body felt like cement.

As Langdon shifted, he found himself again facing the window. The lights were out, and in the dark glass, his own reflection had disappeared, replaced by an illuminated skyline in the distance.

Amid a contour of spires and domes, a single regal facade dominated Langdon’s field of view. The building was an imposing stone fortress with a notched parapet and a three-hundred-foot tower that swelled near the top, bulging outward into a massive machicolated battlement.

Langdon sat bolt upright in bed, pain exploding in his head. He fought off the searing throb and fixed his gaze on the tower.

Langdon knew the medieval structure well.

It was unique in the world.

Unfortunately, it was also located four thousand miles from Massachusetts.

Outside his window, hidden in the shadows of the Via Torregalli, a powerfully built woman effortlessly unstraddled her BMW motorcycle and advanced with the intensity of a panther stalking its prey. Her gaze was sharp. Her close-cropped hair — styled into spikes — stood out against the upturned collar of her black leather riding suit. She checked her silenced weapon, and stared up at the window where Robert Langdon’s light had just gone out.

Earlier tonight her original mission had gone horribly awry.

The coo of a single dove had changed everything.

Now she had come to make it right.

I’m in Florence!?

Robert Langdon’s head throbbed. He was now seated upright in his hospital bed, repeatedly jamming his finger into the call button. Despite the sedatives in his system, his heart was racing.

Dr. Brooks hurried back in, her ponytail bobbing. “Are you okay?”

Langdon shook his head in bewilderment. “I’m in … Italy!?”

“Good,” she said. “You’re remembering.”

“No!” Langdon pointed out the window at the commanding edifice in the distance. “I recognize the Palazzo Vecchio.”

Dr. Brooks flicked the lights back on, and the Florence skyline disappeared. She came to his bedside, whispering calmly. “Mr. Langdon, there’s no need to worry. You’re suffering from mild amnesia, but Dr. Marconi confirmed that your brain function is fine.”

The bearded doctor rushed in as well, apparently hearing the call button. He checked Langdon’s heart monitor as the young doctor spoke to him in rapid, fluent Italian — something about how Langdon was “agitato” to learn he was in Italy.

Agitated? Langdon thought angrily. More like stupefied! The adrenaline surging through his system was now doing battle with the sedatives. “What happened to me?” he demanded. “What day is it?!”

“Everything is fine,” she said. “It’s early morning. Monday, March eighteenth.”

Monday. Langdon forced his aching mind to reel back to the last images he could recall — cold and dark — walking alone across the Harvard campus to a Saturday-night lecture series. That was two days ago?! A sharper panic now gripped him as he tried to recall anything at all from the lecture or afterward. Nothing. The ping of his heart monitor accelerated.

The older doctor scratched at his beard and continued adjusting equipment while Dr. Brooks sat again beside Langdon.

“You’re going to be okay,” she reassured him, speaking gently. “We’ve diagnosed you with retrograde amnesia, which is very common in head trauma. Your memories of the past few days may be muddled or missing, but you should suffer no permanent damage.” She paused. “Do you remember my first name? I told you when I walked in.”

Langdon thought a moment. “Sienna.” Dr. Sienna Brooks.

She smiled. “See? You’re already forming new memories.”

The pain in Langdon’s head was almost unbearable, and his near-field vision remained blurry. “What … happened? How did I get here?”

“I think you should rest, and maybe—”

“How did I get here?!” he demanded, his heart monitor accelerating further.

“Okay, just breathe easy,” Dr. Brooks said, exchanging a nervous look with her colleague. “I’ll tell you.” Her voice turned markedly more serious. “Mr. Langdon, three hours ago, you staggered into our emergency room, bleeding from a head wound, and you immediately collapsed. Nobody had any idea who you were or how you got here. You were mumbling in English, so Dr. Marconi asked me to assist. I’m on sabbatical here from the U.K.”