Once again Armand brought the photograph from his pocket and stared at it. Had there been a chair under him, he’d have sat. In his mind he replaced the three scientists with two teary, weary and bored girls and an exhausted Reine-Marie. At the top of the escalator. This escalator. At the Atomium.

That was where the photograph was taken. At the Atomium. This picture placed Guillaume Couture in Brussels with Gerald Bull. Proving he’d stayed on to work with Dr. Bull while Project Babylon was being developed.

Anyone familiar with Gerald Bull’s career, and the Atomium, would have seen that too.

*   *   *

Beauvoir and Lacoste arrived a few minutes later and Gamache showed them the new items on the stage set.

“Brian confirms these pieces weren’t here before,” said Gamache. “And they certainly weren’t out when I was here last week.”

“Where is he?” asked Beauvoir, unpacking his forensics kit and putting on gloves.

“He’s gone downstairs to the greenroom, to be alone.”

He also told them where the picture had been taken.

“Brussels,” said Beauvoir, pausing in his search of the books. “Where Bull was murdered. But when Bull was murdered?”

“We can’t be sure,” said Gamache.

“Antoinette might’ve hid all her uncle’s things in the basement and then brought them here in the last few days,” said Lacoste. “That suggests she knew her uncle was involved with Gerald Bull and the gun. Why else hide the things? Why else bring them here?”

“To get them out of the house, I agree,” said Beauvoir. “But why only in the last few days? What happened then? She didn’t do it when she took over his house. She didn’t do it when Laurent was murdered. What happened to make her get the wind up?”

“The gun,” said Gamache.

“But it was found when Laurent died,” said Lacoste. And then it dawned on her. “But no one knew what was under the netting. It was only three days ago that people found out it was Gerald Bull’s missile launcher.”

Gamache nodded. “I think when Antoinette heard, she panicked. She must’ve realized it was her uncle’s gun and that was why Laurent was killed.”

“She was afraid she’d be next,” said Beauvoir. “If the murderer found out about her uncle and his connection to Bull.”

“And she was right,” said Lacoste. “But by the time she hid the things, it was too late.”

“Which means,” said Gamache, “her uncle must’ve told her at least something about his work.”

“Probably to warn her,” said Lacoste.

“But how did the murderer find out about Dr. Couture? And that his niece was living in his home?” asked Beauvoir.

“The photograph of them together in Brussels was published in his obituary, probably furnished by Antoinette, not realizing what it revealed,” said Gamache. “Anyone looking for the plans would see the significance immediately.”