“But suppose the rolled-up canvas was already painted,” said Clara. “Could the asbestos be applied then?”

“Not as effectively, as I said. It would slide right off. It needs something to stick onto.”

“Like the back of the canvas,” said Myrna, and they looked at her. “If the front was painted, the back would still be just raw material, right? Something for the asbestos to”—Myrna turned to Julie—“in your words, ‘stick onto.’”

Julie nodded. “It would work. When the painting was unrolled, the asbestos would get into the air.”

“But it gets worse,” said Clara. “The painting wouldn’t just be unrolled. It would have to be tacked onto a frame. I’ve done it lots of times. Bought a cheap old oil painting at a flea market that wasn’t framed. Just rolled up. You have to staple it to a wooden frame.”

“And if the back was coated with asbestos dust?” asked Myrna.

“It would get everywhere,” said Julie. “On the hands, the clothing. In the air.”

“To be inhaled,” said Myrna.

Julie was looking at them, her exuberance muted by a dawning suspicion.

“How long would it take someone to get sick?” asked Myrna.

“Depends on the exposure. Like I said, it might never happen,” said Julie, guarded now. “But mostly it took years, decades, for asbestos to become lethal.”

She looked at their grim faces. “What’s all this about? You’re not planning to do it, are you?”

“And if we were?” asked Gamache.

“You’d be murderers.” She looked pale and Gamache hurried to reassure her.

They weren’t planning murder. Just the opposite.

“You’re trying to stop a murder?” she asked, incredulous. Looking from face to face and back to Gamache. “But if it’s asbestos, you’re probably too late. The person would’ve already been murdered. They just haven’t died yet.”

She left then.

Armand watched as she walked away, steadying herself in the increasing roll and pitch of the ship. She looked like a gull in trouble.

And Gamache knew that while she’d helped them, they had not helped her.

Julie wasn’t as cheery, not as bright as before she’d joined them. They’d tarnished her.

Now the four friends walked around the deck, mulling the young teacher’s information. As they circumnavigated the ship, the Loup de Mer made its way up the coast. Every now and then they needed to steady themselves as the ship plowed up and through and down a wave. The wind was stronger now, and the waves higher, splashing over the sides and turning the deck slick.

“Those tubes almost certainly contained paintings,” said Gamache. “No Man’s paintings.”

“But why would there be asbestos on them?” asked Clara. “Who put it there?”

“And why?” asked Myrna.

They walked in silence, each trying to work it out.