“Improvised munitions. Standard in the handbook that was produced during the Vietnam War. You can use match heads as the propellant and shoot projectiles like nails thirty or forty yards with a fair amount of accuracy. That explains Jeb’s stockpile of matchsticks. Could have been a hobby of his.”

There were three homemade guns in the canister, along with a bunch of nails and several boxes of matches.

“It would take a while to reload.”

Xavier nodded. “Forever. But better than nothing if you’re sneaking up on an armed merc.” He returned his attention to the paper. “What else does it say?”

She studied the drawings, words, and numbers, reminding herself George was an artist. None of the markings on the page was done in error.

“Those are lightbulbs.” She pointed to the three balloon-shaped drawings by Harriet’s name. “He’s colored them in with black dots, like a comic book drawing. I presume that indicates black powder? And this one on the end…it’s shattering, and inside is a shape that looks like a comic book kapow! bubble. He couldn’t know we’ve seen Jeb’s workbench, so I think he’s telling us the lightbulbs are bombs.”

“He’d probably guess that once I saw the match guns in the canister, I’d recognize other improvised explosives.” He touched Harriet’s name on the page. “So…does this mean he’s planted explosive lights in the second-floor Jamison Library?”

“How could he? He’d need to have gotten inside to do that, before he left this message for me.”

“Or he has a plan for getting inside. And he left you this note to tell you what he’s up to. We just need to figure out how he plans to do it.”

“He has special access because he uses the woodshop year-round and has wintered here for the last three years. He has the full employee key chain. Hell, he probably has keys I don’t even have.”

“His keys wouldn’t work because we substituted all the exterior doors.”

“All the doors? Even the third-floor doors and windows?”

“The balcony doors don’t have mechanical locks with keys. It’s all pegs and bolts that can only be locked and unlocked from the inside. Same with the windows.”

“Not the attic window on the end, and not the interior door that leads to it.”

“What do you mean?”

“On the third floor, there’s a half door at the end of the hall. It goes to the old fire escape.”

“That door goes to the eave crawl space. No outside access.”