Gamache got up. "That was a big boot you used, Chief Inspector. You hit CSIS where it hurts. In their secret parts. But we can at least see their reaction. You also delivered a swift kick to the killer and he's still invisible to us."

"I'm hoping this will make him act," said Lacoste, also rising. She examined his face. So familiar from so many conversations just like this. Except he'd always been the one making the decisions.

"Did I make a mistake?" she asked.

"If you did, it was one I'd also have made," he said, and smiled. "It's dangerous, but necessary. This is not a time for timidity. Or secrets."

"Except ours," said Beauvoir.

CHAPTER 18.

Michael Rosenblatt looked up from his French toast and saw the Srete officers get up to leave.

He'd been reading and making notes and eating. The trip to this little village had been a revelation. The village itself had been a revelation. As had the excellent French toast and sausages and maple syrup almost certainly made from the sap of trees he could see out the window.

But mostly that gun had been a revelation. When he'd crawled through that tiny opening on his hands and knees and looked up, he half expected to hear the celestial choir singing, "Ahhhh."

There was Gerald Bull's Supergun. Bathed in light.

G.o.dd.a.m.ned Gerald Bull. Dead, but never gone. How had he done it?

How had he built the G.o.dd.a.m.ned gun?

Professor Rosenblatt looked at the papers by his plate, then over to his notebook, slightly stained by drops of maple syrup. One word had been written large, and circled.

How.

Then he wrote, Why?

That too seemed a good question.

But now that he thought about it, he added another.

Who?

Professor Rosenblatt put down his pen and watched Gamache say good-bye to his colleagues.

John Fleming. When the former Chief Inspector had said that name it had rattled the professor. He hadn't heard it in years. He knew, of course, who Gamache meant, and he could see the CSIS people knew too. The serial killer. A man gone badly wrong.

But to make the connection between Fleming and Bull? It seemed incredible.

Professor Rosenblatt watched as Gamache and the Srete officers parted. He could see the expressions on the young officers' faces as they looked at Gamache. With some concern and a great deal of affection.

Here was a nice man, Rosenblatt felt, and he realized that he did not himself know many nice people. Clever people, smart people, accomplished people, certainly. But not very nice. And not always good.

"I hope I'm not disturbing you," said Gamache, walking across the wide-plank floor to the professor's table.

"Not at all, please." Rosenblatt indicated a seat in the booth across from him.

"Did you sleep well?" Armand asked, sliding in.

"Not so well," admitted Rosenblatt. "New bed. New Supergun."

Gamache grinned. The professor did, in fact, look tired. But his eyes still glowed with intelligence.

Here is a formidable man, thought Gamache.

Here is a formidable man, Rosenblatt knew. While his a.s.sessment that Gamache was a nice man hadn't changed, it had broadened. To include what else he now knew about Armand Gamache, having done some research the evening before.

The large and thoughtful man across from him had turned in, and on, his superiors. He'd killed. And almost been killed.

Rosenblatt had learned those eyes, as kind as they appeared, had seen things few others had. And the hand that shook his, as warm as it was, had done things.

And would again, if need be.

Michael Rosenblatt was both comforted and a little frightened by Armand Gamache.

"You obviously spent some time in the night thinking about the gun," said Gamache. "The CSIS agents have their strengths but they're not scientists. I'd like to hear what you make of Gerald Bull's creation."

Professor Rosenblatt shook his head and exhaled. "As a scientist? It's even bigger than I imagined possible. Incredible. Powerful, but also elegant."

"Elegant?" said Gamache. "An odd word for something destined to become a weapon of ma.s.s destruction."

"It's not a moral judgment, it's just a description of the mechanics. Mostly what we mean by elegant is that it's simple. Easy to use."

"It's simple?"

"Oh, yes. The best designs are. That's its genius. It looks complex because it's so big. But there aren't all that many moving parts, so it would be fairly easy to manufacture and a.s.semble. And fewer things to break down. Like a slingshot is elegant, or a bow and arrow. Or the gun you wore."

"I rarely wore a gun," said Gamache. "Hate the things. They're very dangerous, you know."

"You don't believe in the theory of the balance of terror?" asked Rosenblatt.

"Prime Minister Pearson's phrase to describe the Cold War?" said Gamache. "I think he used it as a condemnation and warning, not as a goal."

"Maybe," said Rosenblatt. "But it has worked, hasn't it? When both sides can destroy each other, neither side is willing to pull the trigger."

"Until you give that weapon to a madman," said Gamache.

Rosenblatt's face grew grim and he nodded. "That's the flaw in the argument."

"So Gerald Bull's gun is elegant," said Gamache. "But is it still relevant, or have time and technology pa.s.sed it by?"

"A slingshot will still kill," said Rosenblatt.

"And so will a bow and arrow. But it's not an advantage when faced with a nuclear bomb."

Rosenblatt thought for a moment. "I feel I should agree that the ICBMs of today are more dangerous than what Bull designed thirty years ago, but the fact is, they aren't. What Gerald Bull built might be less s.e.xy, but it gets the job done."

"The question is, what was the job?" said Gamache.

"Yes, that is a good question."

"If the Supergun is really just a huge cannon," said Gamache, "would it fire only conventional missiles or could it be adapted?"

"It would fire anything put into it."

Gamache paused to absorb that statement, said so matter-of-factly.

"Including a nuclear warhead?"

Rosenblatt shifted a little in his seat and nodded.

"Chemical weapons?" asked Gamache.

Another nod.

"Biological weapons?"

Now Rosenblatt leaned forward. "It would shoot a Volkswagen into the lower atmosphere. It would carry whatever the person firing it wanted."

That was followed by silence.

"So what's it doing here?" Gamache asked.

More silence, until Rosenblatt finally spoke, quietly. "I don't know."

"Guess."

"I won't guess. I'm a scientist. Guessing isn't part of what I do."

Gamache smiled. "Of course it is. Scientists come up with theories all the time. What are they except best guesses? Try. It's not as though you haven't been sitting here wondering the same thing."

Professor Rosenblatt took a deep breath. "It could be a prototype, something to show buyers. That might explain why the firing mechanism is missing. It's not meant to be fired. It's meant as a sort of mock-up. A sales tool."

"Or?"

"Or it's meant to be fired. Did you notice where it's pointed?"

"Into the United States," said Gamache. "Which theory do you think is most likely? A mock-up, or built to be used?"

Rosenblatt shook his head. "The missing firing mechanism is a puzzle. Was it never made? Was it removed?" He looked into Gamache's face. "I honestly don't know."

Armand Gamache wasn't sure he believed the scientist, but he knew he would not, at this point, get a clearer answer.

"The good news is we found the Supergun before it could be fired, if that was the intention," said Gamache. "Unfortunately, it cost Laurent Lepage his life."

Professor Rosenblatt looked closely at his companion. "You're retired. What's your interest in this?"

"Laurent was my friend."

Rosenblatt nodded. The statement was simple. Elegant. And as powerful as the gun.

"And now you're out for revenge?" asked Rosenblatt.

Gamache tilted his head slightly. "I hope that's not it."

Now it was Rosenblatt's turn to tilt his head. "But you're not sure."

"Anything interesting in the papers you borrowed?" Gamache asked, his voice clipped.

Rosenblatt looked at him for a moment, then dropped his gaze to the pages.

"A shame about the blacked-out bits, but I don't think there's really anything in here that isn't common knowledge."

"Common?"

"Since Bull's death and with the pa.s.sage of time, some information has come out about his work," said Rosenblatt. "I'm sure you've found some yourselves now that you know the key words. But there're still some things only people in the field know, or guessed." Rosenblatt paused a moment. "Theorized."

"And what field would that be?"

Rosenblatt realized, too late, that his initial impression had been right. Here was a dangerous man. And he'd led him into dangerous territory.

Rosenblatt's formidable mind raced, but kept coming back to the same place.

He could lie, but it would be found out eventually.

"The field of armament design," said Professor Rosenblatt, and noticed that Gamache showed absolutely no surprise.

"It would have to be, wouldn't it?" said Gamache, being equally open with Rosenblatt. "After all, why else would you be here?"

The two men stared at each other. Not challenging, not threatening each other. There was no power struggle. Just the opposite.

There was recognition.

Here was someone else best in his field. And that field was pitted, and weedy, and pocked with land mines. You didn't get to the other side without some wisdom, and without some wiles. And without some scars.

"What are you asking me, monsieur?"

"I'm asking if you worked with Gerald Bull."

Gamache saw the eyes flicker, wanting to drop, to break contact. But they held, and Michael Rosenblatt gave one curt nod.