McAdams continued to drum the dash. “I looked at art thefts. I didn’t find anything recent in the area. If someone has been selling stolen art, I’m thinking that he or she is a pro and has been doing it for a while. He—or she—just hasn’t been caught.”

Decker nodded. “And you know about the Art Loss Register, right?”

“Yes, I do know from my father. It’s a stolen-art site. Before museums, auction houses, and galleries acquire any work, the purchaser looks up the piece in question to make sure the work wasn’t stolen.” McAdams started snacking on nuts. “Maybe I should start looking up cases on the register. I mean I’m not saying that our alleged buyer—” He paused. “Alleged? Is that even the right word? This person may be entirely fictitious.”

“Alleged is fine, Harvard.”

“Yeah, okay. I’m not saying our alleged buyer of stolen art is the same guy who arranged the hit on the Isabella Stewart Gardner Museum. But maybe he arranged some lesser thefts. Like the icons by Nikolai Petroshkovich.”

“I agree. Did you ever find out the names of the original detectives on the case?”

“I . . . uh.” He sighed. “I thought it was a dead end and I didn’t bother. I know, I know. I should stop thinking for myself. My initial reaction is always to bristle at orders. I fucked up. My apologies.”

“Just get it done.”

“I’d call Marylebone right now, but I’m not getting a signal on my phone.”

“Do it as soon as we get back. That way if they tell you something, you can write it down. Then go home and go to sleep.”

“Why bother? All I’ll have is nightmares.”

“Believe me, you’ll sleep. And yes, I think it’s a good idea to start investigating more local art thefts. If Latham and Moreau were stealing things, they were probably small-timers who maybe hit on something big time.”

“Makes sense.”

“So we’re now working on a possible assumption that the thefts are related to the murders and that the burglaries were done maybe at the behest of a third person who’s calling the shots. That theory can change at any time. Don’t get too wedded to it.”

“Open mind.”

“Right,” Decker said. “With that theory in mind, we both think that the murders involve more than just the theft of Tiffany panels. We suspect that Angeline was doing the stained-glass forgeries. She was talented in more than one artistic field. Perhaps she was doing other forgeries as well.”

“Like actual art painting forgeries?” McAdams said. “She’s probably not that good.”

“I agree. So maybe she was doing something that was easier to copy: like antique maps or old nature prints.”

“She couldn’t forge an Audubon, that’s for certain,” McAdams said. “He was a master at watercolors.”