The night before the great Open Tide, nobody on the Marrow Lark could sleep.

It was a ritual of the harbor, and an old one. On the eve of the big surges, the ones that came once or twice a season and lifted the Drift Isles higher and longer than any ordinary tide, a particular hush fell over Saltwick. The fishing fleet stayed at anchor. The Venn ferries sat dark at their berths. Down on the south dock, a few old men in oilskins sat on upturned crates with their pipes glowing, watching the sky, and nobody spoke above a murmur.

Ila stood on the Lark's foredeck at ten at night, leaning on the rail, watching the stars come out.

There were so many of them. She had forgotten. In the bay, with the town lights behind her, the whole dome of the sky lay open, thick and glittering and enormously deep. The Milky Way arched overhead like a spilled bolt of silver. The air was soft and cool, and smelled of rope and brine and the faint green sweetness of weed, and she thought, with a small private ache, that she had been very foolish to stay away so long.

Seven years of safe loops. Seven years of tame islands. And all the while, this had been here. The tide, and the stars, and the wild sweet silence of the open water.

"You're up late."

She did not turn. She knew the voice. She had been waiting for it, without admitting it, for an hour.

"So are you."

"I'm the captain. It's my job." Tamsin came to stand beside her at the rail, with her hands in her pockets and her braid hanging down her back. She smelled of tea and wool. She stood a careful foot away, close enough to be companionable, far enough to deny it. "I wanted to check the route. Do you have a minute?"

"Always."

"It's in the cabin."

Ila's pulse gave a small, traitorous kick.

"The chart?"

"The chart. And my notes. I want to go over the Open Tide approach for tomorrow, and I thought, since you'll be at the wheel." Tamsin cleared her throat. "It'll be easier with the paper in front of you. If you've no objection."

"I've no objection."

"You're sure."

"Tamsin." She turned her head. "I'd like very much to see it."

They looked at each other. The starlight lay silver on Tamsin's face. Something moved in her eyes, some quick, shy flicker, and then it was gone.

"Come on, then," she said.

* * * The cabin was warm.

She had lit the little brass lamp on the desk, and its light lay in a soft yellow pool on the scarred wood. The room smelled of cedar and strong tea. The porthole stood open an inch, letting in a thread of night air that stirred the corner of a map pinned to the wall. A mug sat steaming at the edge of the desk, and beside it, laid out with a ritual precision that made her heart ache, the leather tube.

Tamsin drew out the chart and unrolled it across the desk.

It was blank again.

Ila had half expected that. The orchard and the Shoal and the Hushwater hand had all faded in the course of the day, as though the parchment kept its images only as long as they were needed. Now it lay pale and plain under the lamp, a cracked sheet of old paper with the smell of tobacco and salt.

"It's not doing anything," she said.

"Not yet."

"Does it always wait?"

"It waits for you." Tamsin said it quietly, without turning. She was bending over the desk with her palms flat on the wood, her braid slipping forward over her shoulder. "It's done this since the day you came aboard. Hushwater, the Shoal. It only wakes in your presence."

"That isn't possible."

"I don't know what's possible. I only know what I see."

Ila crossed the room slowly.

It was a small cabin. There was a narrow strip of floor between the bunk and the desk, and she moved into it as carefully as into a minefield. She stopped on the opposite side from Tamsin. The lamp stood between them. The chart lay between them. It was a piece of furniture, a chaperone, a wall, and it hummed faintly, a thin silver thread of sound.

"Show me," she said.

She bent over the paper.

Tamsin, from the other side, did the same.

They were very close. Their heads were nearly touching above the parchment, and she could feel the warmth of Tamsin's breath on her forehead. She could see the faint fine freckles along her cheekbones, the dark crescents under her lashes, the tiny pulse in her throat. The lamp threw a golden halo around them both. The air in the cabin seemed to thicken and slow.

"The approach," said Tamsin, not very steadily. "Is here. We come out of the breakwater at oh-five-twenty. Then north-northeast, past the Gull Rest light. If the surge holds, the first island will."

She reached out to point.

Ila reached at the same moment, to trace the line.

Their fingers touched on the edge of the parchment.

* * * The first thing Tamsin felt was heat.

It rose from the paper like a breath, from the hollow where their hands met, a slow warm flush that spread up her wrist and over her forearm and into her chest. It was a gentle thing. It was very like the first sunny morning after a long winter, when the light falls through a window and warms the skin before the room has had time to thaw.

The second thing she felt was the paper moving.

It stirred under her palm. A faint rustling crawl, a slow subtle shiver, as of something stretching in sleep. And then a line appeared. A single thread, rising out of the blank, drawing itself across the parchment in a long, slow, deliberate curve. It was gold. It shimmered in the lamplight, wet and bright, like ink fresh from the pen.

She heard Ila draw in a breath.

The gold thread reached the center of the page and paused. It trembled, as if listening. And then it was joined by another, a second line, rising from the opposite side. Teal this time, a deep clear blue-green like water over sand. It moved with the same slow grace, curving across the pale surface, drawing nearer.

"Don't move," said Ila, hoarsely.

"I'm not."

"It's. Tam. Look."

She was looking. She could not have looked away if she tried.

The two lines met in the middle of the page, and did not stop. They coiled round one another. They twisted together in a slow spiral, gold and teal, teal and gold, braiding like the strands of a rope. A bright knot formed at the center, and widened, and bloomed, and out of the knot, in spreading rings, came a hundred tiny details. A compass rose, fine as lace. A ring of delicate waves. A scatter of stars.

Then, quite distinctly, two names.

They appeared in a looping italic hand, beneath the compass rose, one on either side of the knot. Written in the same sloping, graceful script she had known since she could read.

Ila.

Tamsin.

Her heart stopped.

It did not skip a beat. It stopped, entirely, for one long cold moment, and then thundered back with a force that shook her ribs. She stared at her own name, written in gold in her father's hand. She stared at the other, in teal, a hand's breadth away. And between them, linking them, the braided knot of ink glowed steadily brighter.

"It's writing us," she said.

"It's writing our names."

"It's." She could not make her mouth work. "Why would it."

The lines moved again.

They separated from the knot and ran outward, each along its own path. The gold line, from Ila's name, snaked out across the parchment in a long wavering arc, and Tamsin watched it with an expression of dazed, horrified fascination. It did not wander. It did not hesitate. It slid across the page like a compass needle finding north, and stopped at last, quivering, at the edge of her own name.

And from her own name, the teal line crossed the paper in a smooth clean sweep, and came to rest, trembling, against Ila's.

They were pointing at each other.

It was so plain, so naked, so unmistakable that she felt her face burn to the roots of her hair. It was like being caught in the street in her nightclothes. It was like finding a diary she had hidden in a drawer, open on the table, in front of the very person she had written it about. All her careful denials, all the cold clean walls she had built, stood exposed in four lines of ink.

Beneath the two names, in smaller script, a tiny word appeared. Written in her father's hand. Written with a flourish.

Here.

* * * "It's lying," said Tamsin.

Ila looked up.

She had been looking at the paper for a long time, in a trance. The gold light danced across her face, and her lips were slightly parted, and her eyes, very dark and very wide, held a look of such open, aching wonder that it hurt to see. She seemed hardly to have heard. She was staring at the tiny word with a faint tremor in her mouth.

"It's lying," Tamsin said again, more sharply. "It's an old trick. A reflection, a trick of the paper. It does what it likes. It doesn't know anything."

"It doesn't lie."

"Of course it does."

"Tamsin." Ila's voice was very quiet. "It's your father's chart. It has never in its life lied to anyone."

"You can't know that."

"I can. I do." She lifted her head. Her eyes met Tamsin's across the lamp, and there was something in them that stopped her breath, a naked, trembling honesty, as of someone setting down a heavy load. "I know it because it's saying what I'd say. If I could. If I had any right."

"Don't."

"It says here."

"It says nothing. It's paper."

"Then why are you shaking?"

She was. She had not noticed. A fine fierce tremor ran through her arms, and her fingers, still pressed against the parchment, were shivering like leaves. She could feel her heart in her throat. She could feel the whole terrible thing rising in her, a flood she had held back for seven years, a great swelling tide of wanting.

She wanted to reach across the desk. She wanted to take Ila's face in her hands. She wanted to say something enormous and foolish and entirely beyond repair, and the wanting was so total, so fierce, so unlike anything she had allowed herself since a cold night on a beach, that for a moment she could not see.

It would be so easy. It would take nothing at all. A step. A breath. A lean across the lamp.

And then what?

Then it would all come down. Then every careful wall would fall, and she would be standing in the ruins with her arms open, like a fool, waiting for the person who had left her once to leave her again. Because Ila had a secret. Because Ila was afraid. Because whatever lay between them, whatever pulled so hard that it made the paper sing, there was a hole in the middle of it, a black pit seven years deep, and neither of them had yet found the bottom.

She could not do it.

She took her hand from the chart.

She did it slowly. She did it with great care, as one lifts a hand from a hot stove. She pulled back, one inch, two, and the gold light flickered, and the ink began to fade. The compass rose dimmed. The stars went out, one by one. The two names blurred and softened and melted back into the paper, like writing on a window breathed upon in winter.

The knot of braided lines drew in on itself and vanished.

For a moment there was only the empty parchment, and the lamp, and the stillness of the room.

* * * Ila did not move.

She stood where she was, with her hands on the desk and her head bent, and she watched the last trace of the gold seep out of the paper. It left no mark. It left no shadow. It left only a faint warmth in the air, like the memory of a touch. And then even that was gone.

She had not known she could hurt this much.

It was a silly thing. It was a trick of old magic and bad light. But the moment Tamsin's hand lifted, she felt the loss as a physical absence, a cold dropping sensation in the pit of her stomach, as though a rope she had been clutching had been quietly cut. She stood on the edge of a very high place, in the dark, and felt the ground go.

"You can't un-see it," she said.

Her voice was low and rough. She did not recognize it.

"I'm sorry?"

"What it showed us. You can't take it back. It's out. It's in the room." She raised her eyes. "You saw it. And so did I. And you can say it's a lie, if you like. You can say it's a trick. But I'll know. And so will you."

"I'll forget it by morning."

"No, you won't."

"Watch me," said Tamsin.

It was meant as a challenge. It came out as a plea. Her voice cracked in the middle, on the last word, and she turned abruptly aside, and stood with her back to the desk, her shoulders hunched, her hand pressed hard against her mouth. Ila heard her draw in a long unsteady breath. She saw a muscle jump in the line of her neck.

She is as frightened as I am, she thought.

It was the second time she had understood that. It did not get easier.

"Tam," she said, very gently.

"Please go."

"I'm not going to say anything."

"Please."

"I won't touch you. I won't ask for anything. I only." She stopped. She swallowed. She said, in a rush, before she could think better of it, "I only want you to know that I'm not afraid of it. Of what it said. I'm afraid of a great many things. But I'm not afraid of that."

There was a long, long silence.

Tamsin did not turn round. She stood with her face to the bulkhead and her fist clenched at her side, a rigid dark outline against the lamplight, and her breath came shallow and fast.

"Go to bed, Ila," she said at last.

It was not unkind. It was not warm. It was only very, very tired.

Ila went.

* * * She did not sleep.

She lay on her bunk with her eyes open, in the dark, and listened to the sounds of the boat. The soft creak of the hull. The distant lap of the tide against the pilings. The faint thrum of the generator, and somewhere above, the low, steady wash of the wind. It was a good night. It was a sweet, clear, starry night, such as comes once or twice in a season.

She could not bear it.

On the other side of the wall, Tamsin was moving. She heard the creak of the bunk. She heard a shifting, a restless turning, the small dry sound of a hand dragged across a face. She heard a long breath, drawn in and let go, over and over, as if from deep under water. And then, quite suddenly, she heard the crackle of paper.

She sat up.

The chart. Tamsin had taken it out again. She could hear the faint susurrus of parchment unrolling, and the click of a lamp, and a very quiet voice, murmuring something she could not make out. She held her breath. She crept to the wall, and laid her ear against the cold steel.

"...there's no reason," Tamsin was saying, very low. "No reason at all. It's the same as before. It was always going to be like this."

A pause. A rustle.

"I don't want it. I don't. I won't."

A longer pause. The faint patter of a drop falling onto paper.

"Show me something else," said Tamsin Rooke, in a cracked whisper, to a roll of old parchment in the dark. "Show me anything else. Please. Show me something I can bear."

Ila put her hand over her mouth.

She stayed that way for a long time, standing in the dark with her palm pressed against her lips and her forehead against the wall. She did not cry. She did not pray. She only stood, while the stars wheeled and the tide came in, and thought of nothing at all.

At some point, toward dawn, she heard the rustle of the parchment settle. The click of the lamp. The soft sigh of a body sinking into a bed.

She slid down the wall to the floor.

She was still sitting there, drawn up in the dark with her arms around her knees, when a faint pale light began to creep under the door of the cabin next to hers. Not the lamp. Something gentler. A thin shimmer of gold.

She crawled to the crack and looked.

In the passage, on the cold steel floor, a long ribbon of light was moving. It slid out from under Tamsin's door in a slow shining stream, like honey from a jar, and wound along the corridor toward her own. It paused at her threshold. It curled upward, and fell, and spread out across the floor in a bright, trembling pool, and in the pool, tiny and clear as a drawing in a book, a picture was forming.

It was a map. A very small one. No bigger than her hand. A scrap of sea, a scrap of sky, a long dark line of coast. And at the edge of the picture, rising out of the water, so faint and fine that she had to lean close to see it, an island.

It was shaped like a crescent moon. It had a single hill at one end, and a low, curling spit at the other, and on the hill, a tiny black mark, like a door. Beneath it, in the sweet, looping hand she had known since childhood, was a name.

Vesper.

Her heart stopped.

She knew it. She would have known it blind. She had walked its shore in a dream every night for seven years. She had heard the sound of its water, and the grind of its shingle, and the thing that lived in the dark beneath its hill, speaking softly, patiently, in a voice like a closing door.

She had not told anyone. She had not said the name aloud since the night she left.

And the chart, in the middle of the night, in Tamsin's cabin, on the other side of a steel wall, had written it down.

She stared at the little glowing island, and the light shivered, and began to fade.

It knows, she thought. It's always known.

It's been waiting for me to come home.