The letter arrived on an ordinary evening in midwinter, and Thomas nearly missed the detail entirely, tired from a long day spent helping Wat repair a rail switch that had frozen solid overnight.
Your father finally got that ache in his shoulder looked at, his mother had written, in the same warm, familiar voice she always used for the small, ordinary business of a life continuing three hundred years and one entire world away. The doctor thinks it's just old age catching up with him, though he complains about it enough you'd think it was something dire. He was telling the story again at dinner Sunday about the time you two drove up to the lake for your grandfather's birthday and the car broke down halfway there — you remember, the summer before you started high school. He still laughs about it every time.
Thomas read the passage twice, something small and cold settling at the edge of his thoughts before he could properly name why.
He didn't remember that trip.
He tried, sitting very still with the phone's green glow washing over his hands, to summon the memory properly — a lake, a grandfather's birthday, a car broken down on some forgotten summer highway — and found nothing there at all, no fragment, no half-recalled detail, only the same smooth blankness he might have expected from an event that had simply never happened to him.
He told himself, turning it over carefully, that this proved nothing. Three years was a long time to hold a whole life's worth of memory perfectly intact, especially a life increasingly crowded by ledgers and towers and a falling number that occupied considerably more of his attention lately than any childhood road trip ever had. Memory faded. People forgot things, ordinarily, without any stranger explanation required.
He did not entirely believe himself.
Victoria found him still sitting with the phone in his hands an hour later, the evening's ordinary business of supper and rest entirely forgotten. "What is it?"
"A memory. Or the absence of one." He explained it to her plainly, the lake trip, his grandfather's birthday, the broken-down car his mother remembered so fondly and he couldn't summon at all. "It's probably nothing. I've forgotten plenty over three years. I'd have said the same thing about a hundred smaller details if you'd asked me to recite my whole childhood before tonight."
Victoria was quiet a long moment, and Thomas could see her turning the fear over with the same careful precision she brought to everything, weighing it against the falling number, against the relay's cryptic warning, against every fragment of the strange metaphysics neither of them fully understood.
"You told me once," she said slowly, "that every change you make here weakens the connection. That the anchor falls faster the more you build, the more you alter the shape of things that shouldn't have changed at all." She met his eyes, and he could see her reluctance to finish the thought even as she pressed forward with it. "What if it isn't only the anchor that's changing, Thomas? What if the connection itself is starting to — to blur, somehow. Not just weaken. Change what it's actually carrying, the further the deviation grows."
The cold, small dread at the edge of Thomas's thoughts sharpened into something considerably more solid, hearing her voice the fear he'd been carefully avoiding since the letter first arrived.
"You think my mother's memory is wrong. Not mine."
"I think I don't know which of you is wrong, and that not knowing frightens me considerably more than either possibility alone." Victoria took his hand, her grip tight. "I think, whatever this actually is, you should write it down. Every detail you can't account for, every small wrongness, however easily each one might be explained away on its own. If this is the beginning of something larger, Thomas, I'd rather we have a careful record of exactly how it started, than realize too late that we'd been dismissing the signs one small mercy at a time."
Thomas nodded, and opened the Codex's newest quire that same night, writing the lake trip down carefully, honestly, beside a note in his own hand that he still couldn't decide, turning it over one final time before sleep finally claimed him, whether he was documenting the first sign of something vast and frightening, or simply the ordinary, unremarkable erosion of a memory that had never mattered enough to hold onto properly in the first place.