There was a draft in the attic, and nobody could explain it. Grandpa said it had always been there. Grandma said it was the house breathing. Both of these answers were the sort adults give when they would prefer to keep drinking tea.
Sam was not satisfied. A draft, he reasoned, has to come from somewhere. Air does not simply arrive. So on a slow gray afternoon, when the rain had made the garden useless, he climbed the creaky stairs to find out where the wind was getting in.
The attic was full of the things families keep in case they ever become useful, which they never do. A rocking horse with one ear. A box marked WINTER in confident letters. A lamp shaped, for no reason anyone remembered, like a duck. Sam stood among them and held up a feather from an old cushion, because he had read that a feather shows you where air moves.
The feather drifted sideways.
This was, he thought, extremely promising. He followed it the way you follow a very small, very unreliable dog. Past the duck lamp. Past the box marked WINTER. Behind a stack of paintings of people who all looked mildly disappointed, the feather gave a little tug and pressed flat against the wall.
There was a gap there. A narrow dark line between two boards, no wider than his finger. Cool air leaned out of it, steady and patient, as if it had been waiting a hundred years to be noticed and was not going to hurry now.
"I wonder," Sam said out loud, which is what he always said before doing something interesting.
He pressed on the board. It swung inward with the dignity of a small, secret door, and revealed a space behind the wall about the size of a cupboard. Inside was a little round window, the kind you see high on the front of old houses, its glass gone milky with age. It had been boarded over from inside so long ago that everyone had simply forgotten a window was there at all. A crack in one corner was letting the outside in. That was the draft. The whole mystery, solved, was a forgotten window remembering it was a window.
But it was what sat on the sill that made Sam go quiet. A tin box, rusted at the corners, and inside it a bundle of letters tied with ribbon, a marble the color of a stormy sea, and a child's drawing of the very same house, with a sun in the corner drawn far too large, the way children have always drawn suns.
Sam carried the box down very carefully, the way you carry something that is older than your grandpa.
Grandma looked at the drawing for a long time. "That's my hand," she said finally. "I drew that. I must have hidden this box up there when I was about your age. I wondered for years where it went." She turned the marble over in her fingers, and her face did something complicated and soft. "I'd forgotten I ever wondered."
So the draft was explained after all. Grandpa was fetched to admire the little window, and he stuffed a rolled sock in the crack, which he claimed was carpentry. The house stopped breathing quite so much. The duck lamp was brought downstairs, on the grounds that any lamp brave enough to survive the attic deserved a better life.
That night Sam lay in bed with the marble on the shelf where he could see it, glowing faintly in the last of the light. Somewhere above, the little round window looked out at the rain for the first time in a very long while.
He thought about all the ordinary walls in all the ordinary houses, and how any of them might have a forgotten window hiding a stormy-sea marble, if a person only wondered hard enough to press the board. It was a large and comfortable thought. His eyes grew heavy carrying it. The rain kept up its quiet business on the roof, and the house, patched and pleased with itself, settled slowly into sleep.