Within forty-eight hours of the attack the Italians had managed to identify all those involved. The missile strike had been carried out by a four-man team. The driver of the van was of Tunisian origin. The three men who fired the RPG-7s were of Jordanian nationality and were veterans of the insurgency in Iraq. All four were killed in a volley of Carabinieri gunfire seconds after launching their weapons. As for the three men who had posed as German priests, only one was actually German, a young engineering student from Hamburg named Manfred Zeigler. The second was a Dutchman from Rotterdam, and the third was a Flemish-speaking Belgian from Antwerp. All three were Muslim converts, and all had taken part in anti-American and anti-Israeli demonstrations. Gabriel, though he had no proof of it, suspected they had been recruited by Professor Ali Massoudi.

Using closed-circuit surveillance video and eyewitness accounts, the Vatican and Italian authorities were able to retrace the last moments of the bombers’ lives. After being admitted into the Vatican by an adetto at the Permissions Office, the three men had made their way to Ibrahim el-Banna’s office near the Piazza Santa Marta. Upon leaving each was carrying a large briefcase. As Angelli had suspected, the three men had then slipped into the Basilica through a side entrance. They made their way into St. Peter’s Square, fittingly enough, through the Door of Death. The door, like the other four leading from the Basilica into the square, should have been locked. By the end of the first week the Vatican police still had not determined why it wasn’t.

The body of Ibrahim el-Banna was identified three days after it was pulled from the rubble of the apartment house in Trastevere. For the time being his true affiliation remained a matter of speculation. Who were the Brotherhood of Allah? Were they an al-Qaeda offshoot or simply al-Qaeda by another name? And who had planned and financed so elaborate an operation? One thing was immediately clear. The attack on the home of Christendom had reignited the fires of the global jihadist movement. Wild street celebrations erupted in Tehran, Cairo, Beirut, and the Palestinian territories, while intelligence analysts from Washington to London to Tel Aviv immediately detected a sharp spike in activity and recruitment.

On the following Wednesday, the one-week anniversary of the attack, Shamron decided it was time for Gabriel to come home. As he was packing his bag in the safe flat, the red light on the telephone flashed to indicate an incoming call. He raised the receiver and heard Donati’s voice.

“The Holy Father would like a word with you in private.”

“When?”

“This afternoon before you leave for the airport.”

“A word about what?”

“You are a member of a very small club, Gabriel Allon.”

“Which club is that?”

“Men who would dare to ask a question such as that.”

“Where and when?” Gabriel asked, his tone conciliatory.