Leonard McCoy found the file twenty-six years later, during a refit, and it should not have existed.
He was an admiral by then, which he hated, and he had a bad back, which he also hated, and he had come down to a storage bay on the orbital dock to sign off on the disposition of a decommissioned data core, because a clerk had flagged an encrypted partition nobody had a key for, and regulations said a flag officer had to look at a thing like that before it was wiped.
He almost signed the form without looking. He was old and it was late and the partition was labeled with a string of characters that was not a name.
Then he looked at the string of characters, and stopped.
Because he knew it. He had made it. He had made it at a desk in a sickbay, in a fit of something he had never found a word for, out of the date of a shore leave and the last four digits of a serial number that belonged to a man who, at the time, did not exist.
He sat down on a crate. Then he entered the key, which he had never written down and had never forgotten, and the partition opened, and there it was, in his own hand, forty years old and untouched.
PATIENT: KIRK, JAMES T.
He read it for two hours.
Blood type: AB-negative. Rare. Two donors on the ship and I am one of them. Allergy: retinax V. Old fracture, right clavicle, Academy, unset for two days because he did not report it. Scar tissue, left flank, Tarsus IV. He was thirteen. Sleeps four hours, claims five. Blood pressure runs high, and he lies to me about the coffee.
Every line of it was true. Every line of it had been true for the twenty-eight years he had actually known the man, in the world that actually happened, the world in which James Kirk had commanded a starship, and been his friend, and driven him out of his mind, and was, at that moment, three decks up, an admiral like himself, alive, complaining loudly to somebody about the refit.
And McCoy had written it before any of that. He had written it in a sickbay that never happened, for a man who did not exist, in a fit of grief that only he, of all the living, remembered, because he had needed, that day, to make one record in the universe that said: this man was real.
He had encrypted it under a name that was not a name, and buried it in a dead sector, and then the universe had turned over. The sickbay had never happened. The grief had never happened. The file should have gone with all of it.
It had not. It had ridden through, the way the memory had ridden through, because he had been standing in the Guardian's field when the world changed, and some small stubborn part of what he made that day had been fastened to what was, and had come across with him.
There was exactly one physical object in the universe that remembered James Kirk had ever needed saving. And it was a medical file, written by a country doctor, for a patient who was perfectly healthy and three decks up, arguing about a turbolift.
Leonard McCoy sat alone in a storage bay on an orbital dock, an admiral of the Federation Starfleet, seventy-odd years old, and read his own handwriting about his oldest friend, and could not, for the life of him, explain to the clerk who came looking for him an hour after his shift should have ended why his hands would not stop shaking.
He did not wipe the partition. He signed the form that said he had. It was the second false document he ever filed in his life, and he filed it for the same reason he had filed the first, which he could no longer remember filing, and never would.
Then he encrypted the file again, under a different name that was not a name, and carried it forward.
And he never told anybody. Not Spock, who would have understood. Not Jim, who must never. Nobody, for the rest of his life.