The Black Widow. Daniel Silva

actually recorded an earthquake for the first time in longer than anyone could remember—that the damage extended below ground as well. Water and gas mains cracked throughout the arrondissement, and a Métro train jumped the tracks while approaching the station at the Hôtel de Ville. More than two hundred passengers were injured, many severely. The Paris police initially thought the train had been bombed, too, and in response they ordered an evacuation of the entire Métro system. Life in the city quickly ground to a halt. For the attackers, it was an unexpected windfall.

      The enormous force of the blast dug a crater in the rue des Rosiers twenty feet in depth. Nothing remained of the Renault Trafic, though the left rear cargo door, curiously intact, was found floating in the Seine near Notre-Dame, having traveled a distance of nearly a kilometer. In time, investigators would determine that the vehicle had been stolen in Vaulx-en-Velin, a bleak Muslim-majority suburb of Lyon. It had been driven to Paris on the eve of the attack—by whom, it was never established—and left outside a kitchen-and-bath store on the boulevard Saint-Germain. There it would remain until ten minutes past eight the following morning, when a man collected it. He was clean-shaven, approximately five foot ten inches in height, and was wearing a billed cap and sunglasses. He drove the streets of central Paris—aimlessly, or so it appeared—until nine twenty, when he picked up an accomplice outside the Gare du Nord. Initially, the French police and intelligence services operated under the assumption that the second attacker was male, too. Later, after analyzing all available video images, they concluded that the accomplice was in fact a woman.

      By the time the Renault reached the Marais, both occupants had concealed their faces with balaclava masks. And when they emerged from the vehicle outside the Weinberg Center, both were heavily armed with Kalashnikov assault rifles, handguns, and grenades. The center’s two security guards were killed instantly, as were four other people who had yet to be cleared into the building. A passerby bravely attempted to intervene and was mercilessly slaughtered. The remaining pedestrians in the narrow street wisely fled.

      The gunfire outside the Weinberg Center ceased at 9:59:30, and the two masked attackers moved calmly west along the rue des Rosiers to the rue Vieille-du-Temple, where they entered a popular boulangerie. Eight customers were waiting in an orderly queue. All were killed, including the woman behind the counter, who pleaded for her life before being shot several times.

      It was at that instant, as the woman was collapsing to the floor, that the bomb inside the van exploded. The force of the blast shattered the windows of the boulangerie, but otherwise the building remained undamaged. The two attackers did not immediately flee the carnage they had inflicted. Instead, they returned to the rue des Rosiers, where a single surviving security camera recorded them moving methodically through the debris, executing the wounded and the dying. Among their victims was Hannah Weinberg, who was shot twice despite the fact that she had almost no chance of survival. The attackers’ cruelty was matched only by their competence. The woman was seen calmly clearing a jammed round from her Kalashnikov before killing a badly wounded man who, a moment earlier, had been seated on the fourth floor of the building.

      For several hours after the attack, the Marais remained cordoned off, inaccessible to all but emergency workers and investigators. Finally, in late afternoon, when the last of the fires had been extinguished and the site was determined to be free of secondary explosives, the French president arrived. After touring the devastation, he declared it “a Holocaust in the heart of Paris.” The remark did not meet with a favorable reception in some of the more restive banlieues. In one, there erupted a spontaneous celebration that was quickly snuffed out by riot police. Most of the newspapers ignored the incident. A senior French police official called it “an unpleasant distraction” from the immediate task at hand, which was finding the perpetrators.

      Their escape from the Marais, like everything else about the operation, had been meticulously planned and executed. A Peugeot Satelis motorbike had been left for them on a nearby street, along with a pair of black helmets. They traveled north, the male driving, the woman clinging to his waist, passing unnoticed through the stream of approaching police cars and ambulances. A traffic camera photographed them for the last time near the hamlet of Villeron, in the Val-d’Oise department. By midday they were the targets of the largest manhunt in French history.

      The National Police and the gendarmerie saw to the roadblocks, the identity checks, the smashed windows of abandoned warehouses, and the severed padlocks of suspected hideouts. But inside a graceful old building located on the rue de Grenelle, eighty-four men and women were engaged in a search of a far different kind. Known only as the Alpha Group, they were members of a secret unit of the DGSI, France’s internal security service. The Group, as it was known informally, had been formed six years earlier, in the aftermath of a jihadist suicide bombing outside a landmark restaurant on the Avenue des Champs-Élysées. It specialized in human penetration of France’s sprawling jihadist underground and had been granted the authority to take “active measures” to remove potential Islamic terrorists from circulation before the Islamic terrorists could take active measures against the Republic or its citizenry. It was said of Paul Rousseau, Alpha Group’s chief, that he had plotted more bombings than Osama bin Laden, a charge he did not dispute, though he was quick to point out that none of his bombs actually exploded. The officers of Alpha Group were skilled practitioners in the art of deception. And Paul Rousseau was their undisputed leader and lodestar.

      With his tweed jackets, tousled gray hair, and ever-present pipe, Rousseau seemed more suited to the role of absentminded professor than ruthless secret policeman, and not without good reason. Academia was where he began his career and where, in darker moments, he sometimes longed to return. A respected scholar of nineteenth-century French literature, Rousseau had been serving on the faculty of Paris-Sorbonne University when a friend in French intelligence asked him to take a job with the DST, France’s internal security service. The year was 1983, and the country was beset by a wave of bombings and assassinations carried out by the left-wing terrorist group known as Direct Action. Rousseau joined a unit dedicated to Direct Action’s destruction and, with a series of brilliant operations, brought the group to its knees.

      He remained with the DST, battling successive waves of leftist and Middle East–based terrorism, until 2004, when his beloved wife Collette died after a long struggle with leukemia. Inconsolable, he retired to his modest villa in the Luberon and commenced work on a planned multivolume biography of Proust. Then came the bombing on the Champs-Élysées. Rousseau agreed to lay down his pen and return to the fight, but only on one condition. He had no interest in tailing suspected terrorists, listening to their telephone conversations, or reading their maniacal musings on the Internet. He wanted to go on offense. The chief agreed, as did the interior minister, and Alpha Group was born. In the six years of its existence, it had foiled more than a dozen major attacks on French soil. Rousseau viewed the bombing of the Weinberg Center not merely as a failure of intelligence but as a personal affront. Late that afternoon, with the French capital in turmoil, he rang the chief of the DGSI to offer his resignation. The chief, of course, refused it. “But for your penance,” he said, “you shall find the monster responsible for this outrage and bring me his head on a plate.”

      Rousseau did not care for the allusion, for he had no intention of emulating the conduct of the very creatures he was fighting. Even so, he and his unit threw themselves into the task with a devotion that matched the religious zealotry of their adversaries. Alpha Group’s specialty was the human factor, and it was to humans they turned for information. In cafés, train stations, and back alleys across the country, Rousseau’s case officers met quietly with their agents of penetration—the preachers, the recruiters, the streetwise hustlers, the well-meaning moderates, the blank-eyed lost souls who had found a home in radical Islam’s global Ummah of death. Some spied out of conscience. Others spied for money. And there were some who spied because Rousseau and his operatives had given them no other choice. Not one claimed to know that an attack had been in the planning—not even the hustlers, who claimed to know everything, especially when money was involved. Nor could any of Alpha Group’s assets identify the two perpetrators. It was possible they were self-starters, lone wolves, followers of a leaderless jihad who had constructed a five-hundred-kilogram bomb under the noses of French intelligence and then delivered it expertly to their target. Possible, thought Rousseau, but highly unlikely. Somewhere, there was an operational