He had them in his sights. He waited until he couldn't miss, and then pulled the trigger.

But nothing happened. He pulled it again. But by then it was too late, they were on him, Isabelle Lacoste tackling him, and Beauvoir piling on.

Armand Gamache, a few paces behind the younger agents, pulled out his device and turned on the flashlight app. And there, in the beam, was their murderer. The man who'd searched, like a pirate for treasure, like a leech for someone else's blood, for decades. And when he'd finally found Project Babylon, all it brought was death.

In the beam of light was Brian Fitzpatrick.

CHAPTER 44.

Adam Cohen had arrived back and now sat in the bistro by the fire, picking the label off his beer. He'd been offered a stiff cognac, and had taken a sip because Gamache had one and it looked so good. But while it looked like maple syrup, it tasted like turpentine.

They had the bistro to themselves. It was late and Olivier and Gabri had cleaned up and left, handing the key to Gamache with the request that they lock up when they were done.

Now it was just the Srete officers, helping themselves to the chips and mixed nuts and the drinks.

Jean-Guy tossed a birch log onto the fire and the embers exploded then drifted up the chimney. They stared, mesmerized.

"But why didn't the gun fire?" Adam Cohen asked. "Brian was pointing it right at you."

"Seems the firing mechanism was missing from that too," said Lacoste. "We knew he didn't have a gun, and we suspected he'd look for one in the Gamaches' home, so Inspector Beauvoir deliberately left his behind, in his nightstand."

"Why not just take out the bullets?"

"He might've checked," said Beauvoir. "But no one thinks to check the firing pin."

"We learned that trick from Guillaume Couture," said Isabelle Lacoste. "He took the firing mechanism out of the Supergun for the same reason. So that no one else could use it."

"He had a conscience after all," said Gamache. "But it took the murder of Gerald Bull for him to come to his senses and see that this was not just a job, not some challenge or a problem to be solved as elegantly as possible. What he'd created would kill hundreds of thousands of people."

"The plans were missing," said Jean-Guy. "He might've thought Bull destroyed them himself, or he might've even suspected that Fleming had stolen them."

"If he did suspect, he probably didn't want to confront the man," said Isabelle.

"Why not?" asked Cohen.

"Would you?" she asked.

The young agent shook his head. He still looked pale and shaken from his encounter with John Fleming.

"All Dr. Couture could do to disable Big Babylon was take out the firing mechanism," said Lacoste. "He must've taken it home and made it look like two separate pieces. He told his niece about it, but Antoinette didn't pay much attention until Laurent found the gun, and then was killed."

"But what about Brian?" said Cohen. "How did he know about Dr. Couture and Project Babylon and Antoinette?"

"He told us they'd been together for ten years," said Beauvoir. "That meant they met in 2005. What else happened that year?"

"Guillaume Couture died," said Lacoste. "Antoinette moved into his home, and the obit appeared in the McGill Alumni News. Brian Fitzpatrick was an alumnus. He admits now he recognized Gerald Bull in the photo."

"But how did he even know about Gerald Bull?" asked Cohen. "He's not a physicist."

"No, but he was an opportunist," said Lacoste. "He'd become fascinated by the story of Dr. Bull. In the interrogation tonight, Brian admitted he found out about Gerald Bull and Project Babylon while researching the area for a surveying course. Baby Babylon was mentioned in some obscure publications, and on digging deeper he found vague references to another possible missile launcher Bull had planned. Bigger, more powerful."

"Worth a s.h.i.t-load of money," said Beauvoir.

"What started as a lark, a kind of hobby to find out more about Gerald Bull and this secret testing ground, turned into an obsession," said Lacoste.

"And when he saw the obit," said Beauvoir, "and realized Dr. Couture must've not only worked with Bull, but been close enough to have been with him in Brussels, that's when Brian decided to come down and make the acquaintance of Couture's only living relative."

"Antoinette," said Cohen. "Ten years ago."

"He's told us everything now," said Lacoste. "With the plans gone and the gun found there's nothing left for him."

"But how did you know it was Brian Fitzpatrick who'd killed Laurent and Antoinette?" asked Cohen.

"It was, finally, very simple," said Isabelle Lacoste. "As I went back over the file, over the statements and evidence, and the sequence of events, a few things became clear. The killer had to have been in the bistro that day when Laurent came in. He had to have heard the story of the gun and believed it. That narrowed the suspects down considerably. It also had to be someone who didn't know the boy well. Who left the stick behind. And it had to have been someone who knew that Antoinette would be alone that night. Who fit? A few people."

"But only one person knew that Brian would be away in Montreal all night," said Beauvoir. "And that was Brian. He was also in the bistro when Laurent came roaring in."

"Most of what we knew about Antoinette, and especially the night of her death, we heard from Brian," said Lacoste. "And most of it was a lie. Including that she was expecting guests. But what he didn't know was that she'd begged off of Clara's party and was taking her uncle's things to the theater instead. To get them as far away from her as possible."

"And that was another clue," said Beauvoir. "The fact Antoinette did it when Brian was away instead of asking for his help."

"You think she suspected him?" asked Cohen.

"I'm not sure, but it's possible. What is clear is that Brian started and even fueled the controversy surrounding the Fleming play. He was the one who told us Fleming wrote it. And he continued to support her in producing it, when everyone else backed away."

"He wanted the controversy and the distraction," said Beauvoir.

"A killer hides in chaos," said Cohen, and the homicide investigators smiled.

"I was hampered by a misconception," Lacoste admitted. "I was sure the killer had to have been connected to Gerald Bull. Had to have been involved with Project Babylon either as a scientist or as another arms dealer or one of the intelligence agents. But that would put the person well into their fifties. It didn't occur to me the killer could be someone younger, who'd become obsessed with finding the gun. But once I set all that aside and just looked at the facts, all the confusion cleared away."

"Brian says he didn't mean to kill Antoinette," said Beauvoir. "He says she came home and found him searching. In the argument she fell and hit her head."

"Do you believe him?" asked Cohen.

"It might be true," said Lacoste. "But I think he'd have killed her anyway. He'd have had to. For the same reason he killed Laurent. To keep her quiet."

"He'd been quietly searching the home for years," said Beauvoir. "That's how he found the Fleming play. And he took a job surveying the area. That gave him an excuse to look for the gun. He admits he even came within yards of it, but missed it because of the camouflaging."

"He'd all but given up, when Laurent showed up in the bistro," said Lacoste.

"Did you suspect him, sir?" Cohen asked Gamache, who'd been sitting quietly, listening.

"Not for a long time. I thought it was strange, though, that everyone else was upset by the Fleming play, except Brian. He said he was just being loyal to Antoinette, but it was more than that. He really didn't care. For him it was just a tool, a kind of stink bomb he tossed into the case. As it turns out, of course, he should have paid more attention to the play. The very thing he was searching for, had killed for, was in the one thing he dismissed. Fleming's play. She Sat Down and Wept."

"I take it John Fleming was not pleased about being taken back to the SHU," said Beauvoir, but on seeing the look on Agent Cohen's face, he immediately regretted his near-jovial tone.

"It was awful." Even Cohen's lips were white and Jean-Guy wondered if the young man might wake up with white hair the next morning. "I've never believed in the death penalty, but as long as John Fleming's alive I'm going to be afraid."

"Did he threaten you?" asked Gamache.

"No, but..."

Young Agent Cohen turned even paler.

"... I made a mistake, sir."

"It's all right," said Gamache.

"You don't understand," said Adam.

"But I do, and it's done now. Please don't worry."

They looked at each other and the younger man nodded.

"So Brian admits it all?" said Cohen, leaving the subject of Fleming.

"Hard to deny it, when we found him with the firing mechanism he stole from my desk," said Gamache.

"That was dangerous, wasn't it?" said Cohen. "Suppose he'd gotten away?"

"It wasn't the real one," said Lacoste. "That's safe under lock and key. We needed to flush him out. We didn't have enough evidence against him. He had to incriminate himself."

"So you let him think you'd stolen the firing mechanism," said Cohen to Gamache, who nodded.

Young Agent Cohen took a swig of his beer, then reached for the chips, putting some in his mouth before he realized they were not potato but apple chips.

He looked at Chief Inspector Lacoste, and Inspector Beauvoir. His bosses. And he looked at Monsieur Gamache. And he looked at the strong beamed ceiling and thick plank floors and solid fieldstone hearths of the bistro. He looked out the window, but saw only their own reflection.

And he finally felt safe.

CHAPTER 45.

Isabelle Lacoste and Adam Cohen walked up the steps to the B and B. The porch light had been left on by Gabri and the door was, of course, unlocked.

"You said you made a mistake with Fleming," Isabelle asked. "What was it?"

Adam Cohen gnawed his lip and watched Gamache and Inspector Beauvoir walking, heads down and together, toward the light at the Gamache home. But then the two men paused, veered, and took a turn around the village green.

"I said his name," said Cohen.

It took Isabelle Lacoste a moment to realize what Cohen meant, and then she too looked at the two men, strolling around the edges of the village green.

Adam Cohen, in his excitement, had called out over the phone. He'd said his name. Monsieur Gamache. And John Fleming, in the backseat, would have heard.

"I wanted to ask you about Professor Rosenblatt," said Jean-Guy. "What did you say to him tonight, out on the terra.s.se? Did you thank him?"

"Non. I warned him."

"About what? He stepped in front of the gun. He saved your life and probably mine, and allowed the plans to burn. Kept them out of the hands of those CSIS agents or whatever they are."

"I wonder if that's true."

"What do you mean?"

"I mean that I don't think Professor Rosenblatt does much that is unconsidered. I think he knew the moment to get those plans had pa.s.sed. And when he stepped in front of the gun, he knew that while Delorme might shoot us, he wouldn't shoot him."

Gamache remembered that moment with complete clarity.

When Michael Rosenblatt had stepped in front of him, with the gun pointed at his chest, Gamache had had the overwhelming impression that Rosenblatt was in no danger.

In that split second, as the plans burned, Delorme should have shot. But didn't. To kill Gamache and Beauvoir, for plans that were almost certainly gone, would trigger an international manhunt. And so Professor Rosenblatt had done the only thing possible. He'd stepped in front of the gun, not to save Gamache or Beauvoir, but to salvage whatever he could of the situation.

"You think Rosenblatt's one of them? A CSIS agent, or something?"

"Or something," said Gamache.

He did not believe Michael Rosenblatt was himself a killer, though he thought the man might be capable of it. But he did think Rosenblatt knew Mary Fraser and Sean Delorme much better than he pretended.

After all, who called them to Three Pines? Who told them about finding Project Babylon?

Gamache had suggested as much to the retired scientist when they'd parted on the terra.s.se. And warned him he'd be watching.

"You still think I'm mixed up in this?" Rosenblatt had asked.

"I think you know far more than you're telling."

Rosenblatt had studied him closely. "We're on the same side, Armand. You must believe me."

"Do you swear it?" Gamache had asked. "On your grandson's life?"

Professor Rosenblatt had smiled and Gamache heard a small grunt of acknowledgment. "I do."