Toward the end of that same night, when she had given up on sleep for the second time, Mara came back down to the bench.
The yard was dark except for the work lamp, which she lit and turned low. The stove’s heat had not reached out here; the air was cold and clean and smelled of frost and iron filings. She liked the cold after the kitchen. It made her head clear.
She had brought the yard’s spare pressure gauge from the office shelf. It was a brass dial the size of her palm, with a black needle and a glass face, and a short threaded stem at the bottom where it screwed into a line. It was not connected to anything. She set it on the bench under the lamp, face up, and sat looking at it.
The burned letter had left something in her head that she could not put down: one word from it. Ordinary. Or whatever it had been. And under the word, for no reason she could name, the lullaby.
She had been humming it since she came downstairs. She had not meant to.
She tapped the gauge’s glass with her fingernail. The needle quivered and settled. She tapped again, in time with the tune in her head, a light tap on the first beat of each line. The sparks coming down. Tap. The nest. Tap. The resting. Tap.
The needle jumped a little on each tap and fell back. She watched it. She did it again, slower, counting the beats under her breath, and she found that each line of the song landed on the same count, every time, the same number of beats from tap to tap, as regular as a pump stroke. Three lines. Three taps. And the whole of it, from the first tap to the end of the last line, took the same length of time every time she did it.
She took Tavin’s wrist clock from the hook where he had left it and set it beside the gauge and did it again, watching the second hand.
Eight seconds. About eight. She did it five more times and wrote each one down. Eight, eight, a little over eight, eight, eight.
She sat back. A song she had known her whole life, a song about a bird, had a length. A length that held true. She had sung it hundreds of times, thousands, sorting plates, counting steps, rocking Pell to sleep when he was small and their mother was away. She had never once timed it.
Something tugged at the back of her mind. She got up and went to the office and stood on the stool and took down the Founder reference plate from the high shelf, very carefully, with both hands, the way Tavin had held it. She knew she was not supposed to touch it. She carried it out to the bench anyway and laid it under the lamp.
In the lower margin, below the diagram of the lamp’s layers, there was a column of small marks she had noticed when Tavin first showed it to her and had not understood: a row of short vertical lines with numbers between them, labeled in the old Founder script and, under that, in the newer translator’s ink, two words. Entry sequence. The marks were spaced unevenly. Three groups. A short gap, a longer one, a short one again.
She laid the clock beside the plate and counted the spacing against the second hand, using the translator’s scale along the bottom edge. The three groups added up to a little over eight seconds.
She sat very straight on the stool.
She wrote both numbers in the notebook, side by side: Lullaby, 3 lines, ~8 sec (tapped on gauge, 6 trials). And beside it, Founder plate, entry sequence, 3 groups, ~8 sec. Then she sat and looked at the two lines for a while, with the lamp hissing quietly above her.
A sound came from beyond the yard fence: the Tern’s link speaker, clicking on. Sera had moved the ship into the yard’s bay at sundown, as she had said she would, and had been sleeping in the cockpit. Now a small square of green light showed in the cockpit window, and Sera’s voice came out of the external speaker, low and slightly crackling, pitched to carry just as far as the bench and no further.
“You’re up.”
“So are you,” Mara said.
“I’m always up at this hour. It’s when the relays are clear.” A pause, a sound of switches. “You were tapping something. I can hear it through the hull. It’s very annoying.”
“A gauge.”
“What for?”
Mara hesitated. Then, because it was the middle of the night and there was no one else, she told her: the song, the eight seconds, the marks on the plate.
Sera was quiet for a moment. Then she said, “Hold on,” and the speaker clicked, and clicked again, and there was a hiss of static that rose and fell like breathing, and under it, very faint, a second voice.
“I have a relay open to Lorn’s Reach,” Sera said. “To my sister’s school. They have a gauge there. The same type as yours, I’d guess; it’s a standard Compact make. My sister reads it every night for the heat log.” A pause. “She’s reading it now. I asked her to time your song.”
“She knows the song?”
“She knows it. She teaches it to the little ones,” Sera said. “Half the songs in that school came in on freighters, one crew at a time. Nobody remembers who brought which.”
Mara had thought the song was theirs alone, her mother’s and hers and Pell’s. She sat with that.
The static rose and fell. Then the second voice came closer, still faint, still blurred by distance, but clear enough to understand: a woman’s voice, short and exact. Mara could not hear the words at first. Sera relayed them.
“My sister says eight, not seven,” Sera said. “She says you’ll want to know it’s eight because someone always says seven. She’s counting her children.”
“Counting her children?”
“The children are singing it. She has them sing it while she watches the gauge. It’s how she gets them to sleep in the cold room.” Sera’s voice was level, neutral, the voice she used for anything that mattered. “Twelve of them, tonight.”
The woman’s voice came again, through the hiss, closer still. This time Mara heard the words herself, small and clear across a distance she could not imagine.
“Eight. Count it again.”
Mara counted it again. She tapped the gauge with her fingernail on the first beat of each line and watched the second hand of the wrist clock and hummed softly, and at the far end of the relay, on a world under a failing lamp she had never seen, twelve children she would never meet were singing the same song to a woman reading the same kind of gauge.
Eight seconds. The second count matched the first.
“Eight,” she said.
“Eight,” Sera said. “She says good.”
Behind Mara, the kitchen door opened and shut. She heard Tavin’s uneven step on the cobbles. He passed behind her with a bucket in one hand, going to the trough, still dressed, still in his boots. He kept going. He did not look at the plate on the bench, which she was not supposed to have taken down.
“Count quieter,” he said, as he passed.
“The count’s for a gauge. Not for the yard.”
He did not answer. He went on to the trough and filled the bucket and carried it back into the kitchen, and the door shut behind him.
She looked down at the notebook. She underlined ~8 sec twice. In the margin, beside both numbers, she wrote: check against Lorn’s yard gauge — calibrated? Because a gauge on another world was only as good as the last time someone had checked it, and nobody had told her when that had been.
“Sera. Is your sister’s gauge calibrated? When was it last—”
The speaker clicked. The static rose and broke off. The green square in the cockpit window flickered.
“Lost the relay,” Sera said, after a moment. “Patrol’s passing. They jam the band on the sweep.” A pause. “I’ll ask her tomorrow.”
The green square went dark.
Mara sat alone under the lamp. The gauge lay on the bench in front of her with its needle at rest. The Founder plate lay beside it, its column of marks in three uneven groups. The notebook lay open with two numbers side by side and a question in the margin.
She hummed the song once more, slowly, all three lines, not tapping, just listening to it: the falling sparks, the nest, the cooling.
She tried to hear it as a song, the way she always had: a mother’s voice, a cold room, a blanket. She tried to hear it as a sequence of three groups on a Founder plate, with a length to the second. She could not make it be only one of those things. It was both, laid over each other, like the old bell over the valve’s tone in the shed.
She did not know if the eight seconds were a song, or a lock.
And if they were a lock, she thought, sitting without moving in the cold yard while the frost thickened on the bench, then her mother had taught it to her children in the dark, every night, without ever telling them what it opened.