The sun went down over Merrow Island the way it had always gone down: slowly, and then all at once.
Isla stood at the cottage window and watched the sky turn the color of wet paper, and then the color of iron, and then dark. The lighthouse at the northern point was a white shape against the black water, and then it was a black shape against the black water, and then it was gone altogether, the way things go when there is no light left to see them by.
Adam had gone back to the ferry dock to tie up for the night. He had said he would be back at eleven-thirty. He had left his letter on the kitchen table, unopened, the envelope with his name on it in Agnes's handwriting, and the single line on the back in pencil: *He never learned how to forget her, either.*
Isla had not touched it. She had not touched anything in the box since Adam left. She had sat at the kitchen table for a long time, looking at the forty-one envelopes, and she had thought about what her grandmother had written: *Read them in order. The last one is for you.*
She had already read the one on top, the one with her name on it. That had been a cover note, a beginning, not an ending. The last one in the box was also for her. She did not know what that meant. She did not know what any of it meant. She only knew that the box was full of letters her grandmother had never sent, to people her grandmother had never learned how to forget, and that one of those people was sitting across from her at the kitchen table that afternoon, holding an envelope he had never opened, with tears in his eyes.
At eleven-thirty, Adam knocked on the cottage door. Two knocks, short, the way he had knocked when they were young and he was picking her up to go to the dock, or the beach, or nowhere in particular.
Isla opened the door. He was standing there in his dark jacket, with a flashlight in one hand and a thermos in the other.
"Ready?" he said.
"No," Isla said. "Come in anyway."
They walked to the lighthouse in the dark, along the path that ran from the cottage up the hill to the northern point. Isla had walked this path a hundred times as a girl, in daylight, in summer, with her grandmother ahead of her and the gulls overhead. She had never walked it at night. At night it was a different path. The grass was wet. The stones were loose. The sea was on both sides, black and loud, and the wind came off it cold enough to make her pull her jacket tight around her.
The lighthouse stood at the end of the path, white in the flashlight beam, taller than she remembered. The fence around it was mended — Adam's work, neat and careful, the way he did everything. The padlock on the door was new. Adam took a key from his pocket and unlocked it.
"Where did you get that key?" Isla asked.
"Your grandmother gave it to me," Adam said. "Three years ago, when the Coast Guard left. She said, 'Someone has to keep the door from sticking.' She never said why. She never said anything about the light."
He pushed the door open. The smell came out at them — cold stone, and dust, and kerosene, and something else, something warm, like a room that had been lived in recently.
"Do you smell that?" Isla said.
"Kerosene," Adam said. "And —" He stopped. He shone the flashlight up the spiral stairs. "Warm air. Rising. As if something up there is burning."
They climbed. The stairs were iron, and they rang under their feet. Isla counted the turns the way she had counted them as a girl: one, two, three, four, five, six, seven. At the top was the lamp room, a round glass room with a brass lamp in the middle of it, and a desk, and a chair, and a logbook.
The lamp was dark. The room was cold. But the desk was not dusty. Someone had wiped it. And the logbook was open, to a page near the end, and the ink on the page was fresh enough to catch the flashlight beam.
Adam picked up the logbook. He held it so they could both see it. The handwriting was Agnes's. Isla would have known it anywhere — the same tall letters, the same slant, the same way she crossed her t's with a single stroke that went too far to the right.
The last entry read:
*October 12. Wind north-east. Sea moderate. Lamp lit at midnight, one minute, as always. Isla comes home tomorrow. The light is hers now.*
Isla stared at the page. October 12 was the day her grandmother had died. The lawyer's letter had said so. Agnes had died on October 12, in her sleep, in the keeper's cottage, at ninety-four.
"She wrote this on the day she died," Isla said. Her voice sounded strange in the round glass room, as if it were coming from somewhere else. "She knew I was coming home. She knew —"
"She didn't know," Adam said quietly. "She hoped. There's a difference. Your grandmother hoped for forty-one years, Isla. She wrote it down every night. She kept the light burning for forty-one years, and she hoped."
Isla looked at the logbook. She turned the page back. The entry before it was dated October 11. The one before that, October 10. She turned back further, a week, a month, a year. Every night, the same entry, in the same handwriting, with small differences: *Wind south-west. Sea calm. Lamp lit at midnight, one minute, as always.* Sometimes there was a second line: *A ship passed. I waved. It did not wave back.* Sometimes: *Rain. The lamp still lit. The sea does not care about rain.*
"She lit the lamp herself," Isla said. "Every night. For three years, after the Coast Guard left, she climbed these stairs every night and lit the lamp for one minute at midnight. That's why no one could explain it. It wasn't a ghost. It was her."
"She was ninety-four," Adam said. "She climbed these stairs every night until the day she died."
They stood in the lamp room, in the dark, with the logbook between them, and Isla thought about her grandmother climbing iron stairs in the dark, at ninety-four, to light a lamp for one minute, for ships she could not see, for a granddaughter who had not come home in fourteen years.
"Why?" Isla said. "Why one minute? Why midnight?"
Adam did not answer. He was looking at the lamp. He put his hand on the brass, the way a man puts his hand on something he has known for a long time.
"Because," he said, "one minute is long enough for a ship to see you, and short enough that no one on the island notices. And midnight is when the tide turns."
"The tide," Isla said. "The light between tides."
"Your grandmother used to say that," Adam said. "She said the light only matters between tides. When the water is coming in, or going out. When things are changing. The rest of the time, the sea takes care of itself."
Isla looked at her watch. It was 11:52. Eight minutes to midnight.
"Adam," she said. "Your letter. Open it. Here. Now. Before midnight."
He looked at her. He looked at the envelope, which he had carried in his jacket pocket all evening, and which was now in his hand, the paper soft at the edges from where he had held it too tightly.
"I've been afraid to open it," he said.
"I know," Isla said. "Open it anyway."
He opened it. He took out the single sheet of paper inside. He held it under the flashlight, and he read it, and Isla watched his face, and she saw the moment the words reached him, the way you watch a wave reach the shore.
He read it twice. Then he handed it to her, without a word.
Isla read it.
*My dear Adam,*
*You kept the fence mended. That was never a small thing. A fence is a promise that someone is coming back.*
*You never learned how to forget her. I know. I never learned how to forget anyone either. That is why there are forty-one letters in the box.*
*When she comes home — and she will come home, Adam, because the tide always brings back what it takes — do not make her choose between leaving and staying. That is the choice I made her make once, and I have regretted it for fourteen years. Instead, ask her to stay for one tide. Just one. The sea will do the rest.*
*The lighthouse is not for sale. Not really. The town put up the sign. I never signed the paper. It is yours, if you want it. It is hers, if she wants it. It belongs to whoever keeps the light.*
*— Agnes*
Isla put the letter down on the desk, next to the logbook. Her hands were shaking. She looked at Adam, and he looked at her, and neither of them said anything, because there was nothing to say that would not have been smaller than what was in the room with them.
Her watch said 11:59.
"One minute," Adam said. He went to the lamp. He took a box of matches from the desk drawer — the drawer where Agnes had always kept them, the drawer Isla had opened a hundred times as a girl to steal a match and light a candle and pretend she was the keeper.
He struck a match. He held it to the lamp. The wick caught. The flame grew, and the glass of the lamp room filled with light, and the light went out across the water, across the black sea, in a long white beam that turned slowly, the way it had turned for forty-one years, the way it had turned on the night Isla was born, and on the night she left, and on every night in between.
Isla stood in the light, and she looked out at the sea, and she saw a ship on the horizon, far away, a small white shape, and she thought about her grandmother climbing the stairs every night, and about the forty-one letters, and about the tide, coming in and going out, bringing back what it takes.
At 12:01, Adam turned the lamp down. The beam faded. The room went dark again. The sea went dark again. The island went dark again.
But Isla did not feel dark. She felt lit, the way the lamp room had been lit, from the inside, for one minute, at midnight.
"One tide," Adam said, in the dark. "Will you stay for one tide?"
Isla took his hand. His hand was warm. The stairs were cold. The sea was loud. The light was out, but she could still see him, the way you can see someone you have known for a long time, even in the dark.
"One tide," she said.
They climbed down the stairs in the dark, and they walked back along the path to the cottage, and the grass was wet, and the stones were loose, and the sea was on both sides, black and loud, and Isla did not pull her jacket tight around her, because Adam's hand was in hers, and she was not cold.
Behind them, at the northern point, the lighthouse stood dark against the dark sky. But Isla knew now that it was not empty. It was full of light, the way a person is full of light, waiting for midnight, waiting for the tide to turn.
And on the desk in the lamp room, open to a page near the end, the logbook waited too, with its last entry in Agnes's handwriting, and one line Isla had not noticed until now, written in the margin, in pencil, in letters so small she had almost missed them:
*The last letter is not the end. It is the beginning.*
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