“We don’t know that he did keep them,” Lacoste pointed out. “We’re pretty sure he didn’t sell them because no other gun was ever built, but he might’ve destroyed them. We don’t know, and the killer wouldn’t know either.”
“But that would mean the murderer knew about the connection between Antoinette’s uncle and Gerald Bull,” said Reine-Marie. “Why didn’t he look for the plans sooner? Why now?”
“Because the gun was found now,” said Lacoste. “That’s the catalyst. Until then the plans were worthless. But once a working model was found—”
“The plans become priceless,” said Reine-Marie. “I get it.”
“There is another possibility,” said Gamache. “That Gerald Bull never had the plans.”
They stared at him. They’d moved from the soup to fettuccine with grilled salmon, tossed with fennel and apple.
“His apartment in Brussels was searched several times before his death, and nothing was found,” Gamache explained. “After his murder, people looked but the designs for Project Babylon never turned up. It was assumed that Bull, knowing he was in trouble, destroyed them. But suppose they weren’t found on him because he didn’t have them?”
“Because he gave them to Dr. Couture,” said Lacoste.
“Or because Couture stole them,” said Beauvoir.
“Or,” said Gamache, “because Gerald Bull never had the plans to begin with.”
“You think Gerald Bull was the ‘front of house,’” said Lacoste. “And Dr. Couture the real genius?”
“I think it’s possible Dr. Bull did not have the plans because Dr. Bull did not make the plans,” said Gamache. “Do you still have the photograph, Adam?”
Agent Cohen jumped up and returned a moment later with the picture. He put it on the kitchen table and everyone leaned in.
“Do you want more light?” asked Reine-Marie.
“No, this is fine,” said her husband. The candlelight was indeed soothing. “I think they might have been a perfect team,” he said, looking at the photo. “Bull gregarious, outgoing. Dr. Couture quieter, a bachelor scientist. Devoted to his work.”
“His work being Project Babylon,” said Beauvoir.
“According to what you found out”—Gamache turned to Cohen—“Dr. Couture started working with Gerald Bull at McGill, on HARP.”
“Right, but funding for the High Altitude Research Project was cut,” said Cohen. “And Dr. Bull left McGill.”
“What did he do then?” Gamache asked.
“He formed the Space Research Corporation,” said Cohen.
“And the SRC eventually developed the long-range artillery that became Project Babylon,” said Lacoste. “By then it was a private company, run by Bull.”
“Gerald Bull became an arms dealer,” said Gamache. “But not, perhaps, an arms designer.”
“That explains why Project Babylon was built here,” said Beauvoir. “Because Guillaume Couture was here.”
“He built the prototype close to home,” said Lacoste. “Where he could oversee it, but no one else could. In the middle of a Québec forest, where the Iranians, the Israelis, the Iraqis, our own people would never think to look. A gun that doesn’t exist in a village that doesn’t exist.”
“The last place on earth,” said Beauvoir. “Three Pines.”
“And no one guessed that Gerald Bull wasn’t the creator of Project Babylon?” asked Cohen.
“Why would they?” asked Chief Inspector Lacoste. “And who would care? As long as he delivered.”
“And when he’s murdered, Couture gets scared,” said Beauvoir. “He hides the plans, or maybe destroys them, and goes to ground. Retires to his tomatoes and peppers, and tries to forget about the thing in the woods.”
“It was covered with camouflage netting,” said Gamache. “An effort had been made to hide it. And the firing pin was removed. Who else but the designer could do that? Did you find the firing pin in Antoinette’s home?”
“No, though to be fair, we weren’t looking,” said Beauvoir. “We’ll go back and have another look.”
“If it was there, the killer probably took it,” said Gamache. “But worth a look.”
“I’ll double the guard on the gun,” said Lacoste, and headed to the telephone in the study.
The lights suddenly went on, full force, and Armand looked over at Reine-Marie, who was standing by the switch, then she returned to the table.