They headed out onto the roof terrace of the Basilica to walk among the apostles and the saints. Donati’s black cassock billowed and snapped in the cold wind. In one hand, entwined around his fingers like the beads of a rosary, was Claudia’s gold necklace.

      “She was conducting …” Donati paused for a moment, as if searching for the appropriate word. “An investigation,” he said at last.

      “What sort of investigation?”

      “The only kind we ever do around here.”

      “A secret investigation,” said Gabriel. “Ordered by you, of course.”

      “At the behest of the Holy Father,” Donati added hastily.

      “And the nature of this investigation?”

      “As you know, there’s been a debate raging within the art world and the curatorial community over who owns antiquity. For centuries, the great empires of Europe looted the treasures of the ancient world with reckless abandon. The Rosetta Stone, the Elgin Marbles, the great temples of ancient Egypt—the list goes on and on. Now the source countries are demanding the symbols of their cultural heritage be returned. And they often turn to the police and courts for help in getting them back.”

      “You were afraid the Vatican Museums were vulnerable?”

      “We probably are.” Donati paused along the façade of the Basilica and pointed toward the Egyptian obelisk in the center of the square. “It’s one of eight here in Rome. They were built by craftsmen from an empire that no longer exists and brought here by soldiers of an empire that also no longer exists. Should we send them back to Egypt? What about the Venus de Milo or the Winged Victory of Samothrace? Would they really be better off in Athens than in the Louvre? Would more people see them?”

      “You sound like a bit of a hawk on this issue.”

      “My enemies often mistake me for a liberal who’s trying to destroy the Church. In reality, despite my Jesuit education, I am as doctrinaire as they come. I believe that great treasures of antiquity should be displayed in great museums.”

      “Why Claudia?”

      “Because she disagreed with me vehemently,” Donati replied. “I didn’t want the report to be a whitewash. I wanted the potential worst-case scenario, the unvarnished truth about the source of every piece in our possession. The Vatican’s collection is among the oldest and largest in the world. And much of it is completely unprovenanced.”

      “Which means you don’t know exactly where it came from.”

      “Or even when it was acquired.” Donati shook his head slowly. “You might find this hard to believe, but until the 1930s, the Vatican Library had no proper catalog system. Books were stored by size and color. Size and color,” Donati repeated incredulously. “I’m afraid the record keeping at the museums wasn’t much better.”

      “So you asked Claudia to undertake a review of the collection to see whether any of the pieces might be tainted.”

      “With a special emphasis on the Egyptian and Etruscan collections,” Donati added. “But I should stipulate that Claudia’s inquiry was completely defensive in nature. In a way, it was a bit like a campaign manager who investigates his own candidate in order to uncover any dirt his opponent might find.”

      “And if she’d discovered a problem?”

      “We would have weighed our options carefully,” Donati said with lawyerly precision. “Lengthy deliberation is our specialty. It’s one of the reasons we’re still around after two thousand years.”

      The two men turned and started slowly back toward the dome. Gabriel asked how long Claudia had been working on the project.

      “Six months.”

      “Who else knew about it?”

      “Only the director of the museum. And the Holy Father, of course.”

      “Had she given you any findings?”

      “Not yet.” Donati hesitated. “But we had a meeting scheduled. She said she had something urgent to tell me.”

      “What was it?”

      “She didn’t say.”

      “When were you supposed to meet?”

      “Last night.” Donati paused, then added, “At nine o’clock.”

      Gabriel stopped and turned toward Donati. “Why so late?”

      “Running a church of one billion souls is a big job. It was the only time I was free.”

      “What happened?”

      “Claudia called my assistant and asked to reschedule the meeting for this morning. She didn’t give a reason.”

      Donati removed a cigarette from an elegant gold case and tapped it against the cover before igniting it with a gold lighter. Not for the first time, Gabriel had to remind himself that the tall man in black was actually a Catholic priest.

      “In case you’re wondering,” Donati said, “I did not kill Claudia Andreatti. Nor do I know why anyone would want her dead. But if it becomes public that I was scheduled to meet with her the evening of her death, I’ll be placed in a difficult position, to say the least. And so will the Holy Father.”

      “Which is why you haven’t mentioned any of this to Vitale or Metzler.”

      Donati was silent.

      “What do you want from me, Luigi?”

      “I want you to help protect my Church from another scandal. And me, as well.”

      “What are you suggesting?”

      “Two investigations. One will be carried out by Vitale and the gendarmes. It will be short in duration and will conclude that Dottoressa Andreatti took her own life by throwing herself from the gallery of the dome.”

      “Rome has spoken; the case is closed.”

      “Amen.”

      “And the second investigation?”

      “Will be carried out by you,” Donati said. “And its findings will be presented