Whether it had been her dishonesty or her infertility that turned the young man’s heart to stone, Elizabeth would never know. But one week later, she left Venice without her engagement ring.

Her only memento of the heartbreaking trip had been a lapis lazuli amulet. The Rod of Asclepius was a fitting symbol of medicine — bitter medicine in this case — but she had worn it every day since.

My precious amulet, she thought. A parting gift from the man who wanted me to bear his children.

Nowadays, the Venetian islands carried no romance for her at all, their isolated villages sparking thoughts not of love but of the quarantine colonies that had once been established on them in an effort to curb the Black Death.

As the Blackbird tender raced on past Isola San Pietro, Elizabeth realized they were homing in on a massive gray yacht, which seemed to be anchored in a deep channel, awaiting their arrival.

The gunmetal-gray ship looked like something out of the U.S. military’s stealth program. The name emblazoned across the back offered no clue as to what kind of ship it might be.

The Mendacium?

The ship loomed larger and larger, and soon Sinskey could see a lone figure on the rear deck — a small, solitary man, deeply tanned, watching them through binoculars. As the tender arrived at The Mendacium’s expansive rear docking platform, the man descended the stairs to greet them.

“Dr. Sinskey, welcome aboard.” The sun-drenched man politely shook her hand, his palms soft and smooth, hardly the hands of a boatman. “I appreciate your coming. Follow me, please.”

As the group ascended several decks, Sinskey caught fleeting glimpses of what looked like busy cubicle farms. This strange ship was actually packed with people, but none were relaxing — they were all working.

Working on what?

As they continued climbing, Sinksey could hear the ship’s massive engines power up, churning a deep wake as the yacht began moving again.

Where are we going? she wondered, alarmed.

“I’d like to speak to Dr. Sinskey alone,” the man said to the soldiers, pausing to glance at Sinskey. “If that’s okay with you?”

Elizabeth nodded.

“Sir,” Brüder said forcefully, “I’d like to recommend Dr. Sinskey be examined by your onboard physician. She’s had some medical—”

“I’m fine,” Sinskey interjected. “Truly. Thank you, though.”

The provost eyed Brüder a long moment and then motioned to a table of food and drink being set up on the deck. “Catch your breath. You’re going to need it. You’ll be going back ashore very shortly.”

Without further ado, the provost turned his back on the agent and ushered Sinskey into an elegant stateroom and study, closing the door behind him.

“Drink?” he asked, motioning to a bar.

She shook her head, still trying to take in her bizarre surroundings. Who is this man? What does he do here?

Her host was studying her now, his fingers steepled beneath his chin. “Are you aware that my client Bertrand Zobrist referred to you as ‘the silver-haired devil’?”

“I have a few choice names for him as well.”

The man showed no emotion as he walked over to his desk and pointed down at a large book. “I’d like you to look at this.”

Sinskey walked over and eyed the tome. Dante’s Inferno? She recalled the horrifying images of death that Zobrist had shown her during their encounter at the Council on Foreign Relations.

“Zobrist gave this to me two weeks ago. There’s an inscription.”

Sinskey studied the handwritten text on the title page. It was signed by Zobrist.

My dear friend, thank you for helping me find the path.

The world thanks you, too.

Sinskey felt a chill. “What path did you help him find?”

“I have no idea. Or rather, until a few hours ago I had no idea.”

“And now?”

“Now I’ve made a rare exception to my protocol … and I’ve reached out to you.”

Sinskey had traveled a long way and was in no mood for a cryptic conversation. “Sir, I don’t know who you are, or what the hell you do on this ship, but you owe me an explanation. Tell me why you harbored a man who was being actively pursued by the World Health Organization.”

Despite Sinskey’s heated tone, the man replied in a measured whisper: “I realize you and I have been working at cross-purposes, but I would suggest that we forget the past. The past is the past. The future, I sense, is what demands our immediate attention.”

With that, the man produced a tiny red flash drive and inserted it into his computer, motioning for her to sit down. “Bertrand Zobrist made this video. He was hoping I would release it for him tomorrow.”

Before Sinskey could respond, the computer monitor dimmed, and she heard the soft sounds of lapping water. Emerging from the blackness, a scene began to take shape … the interior of a water-filled cavern … like a subterranean pond. Strangely, the water appeared to be illuminated from within … glowing with an odd crimson luminescence.

As the lapping continued, the camera tilted downward and descended into the water, focusing in on the cavern’s silt-covered floor. Bolted to the floor was a shiny rectangular plaque bearing an inscription, a date, and a name.

The date was tomorrow. The name was Bertrand Zobrist.

Elizabeth Sinskey felt herself shudder. “What is this place?!” she demanded. “Where is this place?!”

In response, the provost showed his first bit of emotion — a deep sigh of disappointment and concern. “Dr. Sinskey,” he replied, “I was hoping you might know the answer to that same question.”

One mile away, on the waterfront walkway of Riva degli Schiavoni, the view out to sea had changed ever so slightly. To anyone looking carefully, an enormous gray yacht had just eased around a spit of land to the east. It was now bearing down on St. Mark’s Square.

The Mendacium, FS-2080 realized with a surge of fear.

Its gray hull was unmistakable.

The provost is coming … and time is running out.

Snaking through heavy crowds on the Riva degli Schiavoni, Langdon, Sienna, and Ferris hugged the water’s edge, making their way into St. Mark’s Square and arriving at its southernmost border, the edge where the piazza met the sea.

Here the throng of tourists was almost impenetrable, creating a claustrophobic crush around Langdon as the multitudes gravitated over to photograph the two massive columns that stood here, framing the square.

The official gateway to the city, Langdon thought ironically, knowing the spot had also been used for public executions until as late as the eighteenth century.

Atop one of the gateway’s columns he could see a bizarre statue of St. Theodore, posing proudly with his slain dragon of legendary repute, which always looked to Langdon much more like a crocodile.

Atop the second column stood the ubiquitous symbol of Venice — the winged lion. Throughout the city, the winged lion could be seen with his paw resting proudly on an open book bearing the Latin inscription Pax tibi Marce, evangelista meus (May Peace Be with You, Mark, My Evangelist). According to legend, these words were spoken by an angel upon St. Mark’s arrival in Venice, along with the prediction that his body would one day rest here. This apocryphal legend was later used by Venetians to justify plundering St. Mark’s bones from Alexandria for reburial in St. Mark’s Basilica. To this day, the winged lion endures as the city’s symbol and is visible at nearly every turn.

Langdon motioned to his right, past the columns, across St. Mark’s Square. “If we get separated, meet at the front door of the basilica.”