The Note Left Behind

First Suspicion

Mr. Callahan taught eleventh-grade history, two doors down from Nathan's chemistry class. He was the kind of teacher students genuinely liked — funny in a low-key way, generous with extra credit, the guy who remembered your name even if you'd never been in his class. Nathan had eaten lunch in his room exactly once, sophomore year, during a rainstorm that made outside seating impossible, and Callahan had let half a dozen kids in without complaint.

It felt wrong, even considering it.

"We don't know anything yet," Nathan said, more to himself than to Sasha, as they walked the hallway past Callahan's door that afternoon. Through the narrow window, they could see him at his desk, grading papers, glasses pushed up into greying hair, looking exactly like what he was supposed to look like: a tired, well-liked teacher at the end of a long day.

"No," Sasha agreed. "We don't."

But she didn't look away from the door either, and neither did Nathan, and that was its own kind of answer.

"Twenty-six years here," she said quietly. "Old enough to have been young himself, back when the note would've been written. Young enough that it's not ancient history."

"That's not evidence."

"No," Sasha said again. "It's a start."

They kept walking. Nathan felt Callahan's classroom at their backs the whole length of the hallway, an itch between his shoulder blades he couldn't quite shake, and told himself it was nothing — that they were building a theory out of a single initial and a hunch, the kind of thing that fell apart the second you actually looked at it closely.

He almost believed it.

That night, Nathan lay awake running through everything he actually knew, which wasn't much. A note. An initial. A teacher who'd been there long enough, who had access, who fit a shape neither of them wanted to say out loud yet.

It wasn't proof of anything.

But it was, he was starting to realize, exactly the kind of thing that once noticed, couldn't be unnoticed — the itch under his skin the same one he got from a crooked picture frame, a word spelled wrong on a sign, a fact that didn't sit flush with the rest of the world around it.

Something here didn't sit flush. And Nathan, whatever else he was, had never been able to leave that alone.

He thought about texting Sasha, then decided against it — some things felt like they needed to be said in person, where he could watch her reaction and know whether she was thinking the same thing he was, or something else entirely. Instead he lay in the dark, running through everything he knew about Callahan: the easy jokes, the way he remembered every student's name, the reputation as the "cool teacher" who never seemed to have a bad day.

None of it had ever struck Nathan as suspicious before. That was, he realized uneasily, exactly how it was supposed to work. Nobody built a reputation like that by accident, and nobody kept it for twenty-six years without being very, very good at making people comfortable around him.

He didn't sleep much that night. When his alarm finally went off, the first thing he did was check his phone, half-expecting a message from Sasha that had come in sometime after midnight.

There wasn't one. But when he saw her waiting by the school's front steps the next morning, arms crossed against the early chill, he could tell from her face that she hadn't slept much either.