Matt turned the envelope over in his hands more times than he meant to, his thumb tracing the edge where it had already begun to soften. There was nothing remarkable about it at first glance, plain, unmarked, no stamp, no seal and nothing to suggest where it had come from or who had delivered it. It just his name written across the front and that was part of the problem.

He knew his own handwriting the same way people recognised their own reflection, the slight lean to the right, the way the last letter of his name dragged just a fraction longer than it should, like he never quite lifted the pen in time. It was careless in a familiar way but very unmistakable.

Matt frowned, glancing around as if the answer might be standing a few feet away waiting for him to notice but no one was paying him any attention. No one looked like they had just slipped something into his hand or left it nearby, everything felt normal and that only made the envelope feel more out of place.

He let out a quiet breath and slipped a finger under the flap opening it with a small, deliberate motion. The paper inside was folded once, neat but not precise, as though whoever had written it had not been overly concerned with presentation. He pulled it free, already half expecting some kind of joke, something that would make sense the second he saw it.

Instead, he found four lines.

“If you’re reading this, you’ve already forgotten. Don’t trust them. Especially not the one who smiles first - M”

Matt read it once, his eyes moving quickly over the words as if speed might reveal something he missed. Then again, slower this time, each word settling more heavily than the last but the simplicity of it made it worse. There was no explanation, no context, no hint of humour or exaggeration, just a statement and a warning.

A faint tension crept into his chest, subtle at first, like the distant awareness of something being wrong without knowing what it was. He tried to place it, to match it to something logical, but nothing would quite fit. The world around him carried on as it always did, people moving, talking, existing without interruption and yet the letter sat in his hand like it belonged to something else entirely.

“You’ve already forgotten.”

The line lingered in his thoughts as he stood there, unmoving, turning it over in his mind. He searched his memory carefully, the last few hours, the morning, the day before but everything seemed intact. There were no obvious gaps, no strange interruptions, nothing that suggested something had been removed. If something had been forgotten, it had not left behind an empty space but had been taken cleanly, without a trace.

His gaze lowered again to the page, drawn back despite himself.

“Don’t trust them."

The wording was frustratingly vague, offering no direction, no hint as to who “them” might be. It could mean anyone and that, more than anything, made the warning feel intrusive, like it was trying to reach into his thoughts and quietly alter the way he saw the people around him.

And then there was the last line.

“Especially not the one who smiles first.”

Matt read it again, more slowly this time, as if the meaning might change if he gave it enough attention. It was such a small detail to focus on, something most people would overlook entirely. Smiling was automatic, habitual, often meaningless and a gesture of politeness more than anything genuine. 

So why single it out?

The thought settled in his mind and refused to move, quietly shifting the way he looked at everything around him. Without fully intending to he found himself watching more closely, his gaze lingering just long enough to notice the small details he would normally ignore. The timing of a glance, the curve of an expression, the way someone reacted when their eyes met his. He became aware of how often people smiled first and that perhaps was the most unsettling part of it.

Matt exhaled slowly and folded the letter with careful precision, pressing the crease flat as though he could somehow contain the unease it carried. He slid it back into the envelope and held it there for a moment, his fingers resting against the paper as he considered the simplest option.

Throw it away, forget it, move on.

The thought came easily, but there was a quiet resistance to it, something instinctive that told him discarding the letter would not solve anything. If anything, it felt like it would make things worse as though ignoring it would only leave him unprepared for whatever it was trying to warn him about. He slipped the envelope into his pocket instead, the motion subtle and unremarkable, giving no indication of the shift taking place beneath the surface.

When he looked up again his expression was composed and neutral enough that no one passing by would think twice about him. On the outside, nothing had changed, he was still just another face in the crowd, another person moving through the same ordinary space as everyone else but the way he saw things was no longer quite the same.

His attention lingered where it had not before and his awareness sharpened by something he could not fully explain. Conversations felt slightly off, expressions carried more weight than they should and every interaction seemed to hold the potential for meaning he had not previously considered.

And beneath it all, steady and persistent, the same thought remained.

He was missing something and he had no idea what it was.

Matt didn’t notice when it started and later that would bother him more than anything else. There was no clear moment he could isolate, no point in time where the world shifted and announced itself as different. It simply slipped into place, quiet and gradual, until something that should have felt solid no longer did. A question asked, followed by a pause that felt slightly misplaced as though the response had needed an extra moment to arrive. It was subtle enough to ignore, the kind of thing most people would never register but Matt was already looking for something now.

He stood near the edge of the pavement letting the movement of the street flow around him. People passed in both directions, their conversations overlapping into a steady and indistinct murmur. Cars moved on the road in a predictable rhythm, and nothing, at least on the surface appeared out of place. A man approached from his left, his attention lifting briefly as he drew closer, their eyes met and the man offered a quick, automatic smile, it was polite, effortless and the kind of expression exchanged countless times a day without meaning or memory.

Matt felt a slight tightening in his chest. The words from the letter surfaced immediately, uninvited and impossible to ignore. He didn’t return the smile and the man’s expression lingered for just a moment too long before it faded, settling into something more neutral. His gaze shifted away, and he continued walking without breaking stride, blending back into the movement of the crowd as though nothing had happened.

Matt turned slightly, watching him go, trying to decide if there had been anything truly unusual about the exchange. There was nothing obvious, nothing he could point to with certainty but the feeling remained. It didn’t sit right and his hand drifted to his pocket and his fingers brushed lightly against the envelope, the paper felt thin beneath the fabric but its presence carried a weight that was difficult to ignore. If the letter meant anything then it needed to hold up to something real, it couldn’t just exist as a vague warning without substance, there had to be a pattern, something observable, something he could test.

A woman walked a short distance ahead of him, her attention fixed elsewhere. As she neared him, her gaze lifted briefly, just long enough to register him in her path. Their eyes met, and after the smallest pause, she smiled. It was the same kind of smile, quick and unremarkable as before, Matt held her gaze and gave nothing in return, this time though the reaction was easier to see. The smile didn’t fade naturally but seemed to stop abruptly, as though it had been interrupted mid-gesture. Her eyes lingered on him for a moment, searching in a way that felt disproportionate to the briefness of the encounter, before she looked away and continued past him, her pace subtly increasing.

Matt watched her go, a quiet tension settling deeper into his thoughts, it wasn’t just the smiles, it was what followed them.

People smiled first all the time, that alone meant nothing but the shift, the slight misalignment when he failed to respond as expected, that was harder to dismiss, harder to explain away as coincidence.

His fingers pressed lightly against the envelope again.

"Don’t trust them."