Mary and Sean McMahon moved into Number 10 Nether Oak Close on the first of April, five years to the day before the knock that changed everything.
They never marked the anniversary.
It wasn’t the sort of thing they did.
From the beginning, people found themselves standing on their step without quite knowing why. A neighbour with lost keys. A courier unsure of an address he had delivered to a hundred times before. A child crying over a cat that had not come home.
Mary and Sean always helped.
They didn’t consult one another or weigh possibilities. Answers arrived fully formed, calm and certain, as if recalled rather than discovered. To them, it felt no stranger than knowing when rain was coming or how long to leave the kettle before it boiled.
They never wondered why.
By the door, on a small table shared by the landline phone and a bowl of loose change, sat a stone they had picked up years earlier on a beach below Dún Scáith castle on the Isle of Skye grey, smooth, pierced cleanly through its centre. Mary liked it because it felt warm in the hand. Sean liked it because it fitted in his pocket perfectly.
They forgot it almost immediately.
What they did not know was that the stone had once belonged to Scáthach warrior, seer, and teacher of Cú Chulainn. It was a scrying stone through which all outcomes could be seen, not dimly or symbolically, but plainly, as one sees a road from a hilltop. It carried a geas: all questions asked in its presence must be answered.
Power does not remain contained forever.
It leaks.
It leaves stains.
It settles into the people closest to it.
The knocking became a feature of their evenings. Mary would dry her hands. Sean would answer the door. There would be relief, gratitude, sometimes tears. Always politeness.
Until the night the dishes were stacked neatly in the dishwasher and the knock came firm, deliberate, and unhurried.
Sean opened the door to a woman of indeterminate age. Her hair, long and greying, was braided into intricate plaits and arranged around her head like a crown. Her coat was thin for the cold, but she did not shiver.
She smiled.
“I hear you are good at answering questions,” she said. “My question is this: is there a question you cannot answer?”
Sean paused. For the first time in five years, an answer did not immediately rise.
“I don’t know,” he said at last. “I’m sure there are.”
Mary had come to stand beside him. She looked at the woman carefully, not suspiciously, but with the same attention she gave to simmering milk or a child’s fever.
“I have thought about this,” Mary said slowly. “There are things we cannot see. A coming death. whether love is real” … and Sean added “…and the results of the lottery.”
The woman nodded, satisfied.
“This is so,” she said. “Those are among the questions that have no real answers.”
It was cold on the step. Mary, without thinking, invited her in.
They sat at the kitchen table. Sean made tea. The woman wrapped her hands around the cup and sighed, as if she had been walking a long way.
“My name is Scáthach and my stone has been calling,” she said eventually. “And I have come to reclaim it.”
Mary felt, rather than saw, the presence of the stone by the door. Sean frowned, a small crease forming between his brows.
“You see,” the woman continued gently, “what has leaked into you was never meant for humankind. You have worn it lightly; I will give you that. Kindly. But knowing all outcomes changes the shape of a life. It bends it and leaves it twisted.”
“And if you take it?” Sean asked.
The woman met his gaze, unflinching.
“Then you will stop knowing,” she said. “And you will feel the loss of it, sharply, for a time.”
Mary nodded. She already knew this.
“And if you don’t?” she asked.
The woman’s smile faded, just a little.
“Then the questions will grow heavier,” she said. “And one night, the knock you answer will ask something that breaks you.”
Outside, the Close was quiet. Somewhere a door closed. Somewhere else, a light went out.
By the door, the stone waited.
Sean looked at Mary.
There was no question in his look, there was only acknowledgment of the duty they needed to complete.
Mary rose from the table and went to the small stand by the door. For the first time since they had moved into the house, she really saw the stone, the smooth grey ring, the neat hole through its centre, the way it seemed to draw the light toward it.
She lifted it.
The moment the stone left the table, something inside her shifted. Not a sound, not a thought a pull. As if a thread that had been running quietly through her life for years had been seized and drawn out in one long, rough motion.
Mary flinched.
Sean gasped, sharp and involuntary, his hand flying to the edge of the counter. The room tilted, just slightly, as if the floor had forgotten its place for a heartbeat.
Between them, an absence opened.
Not pain exactly something colder. A hollowness where certainty had lived. Where answers had once arrived already shaped, already finished.
Mary crossed the kitchen and placed the stone into the woman’s waiting palm.
Scáthach closed her fingers around it, and the air settled at once, like water after a dropped weight.
Mary and Sean stood very still.
They did not ask what would come back in its place.
They already knew the answer to that.
Scáthach rose from the table, the stone now gone from sight, as if it had never been there at all.
“Do not think you leave empty-handed,” she said, turning at the door. “The stone always leaves a gift behind.”
Mary felt it immediately, not an answer, not a certainty but a pressure, like the sense that something was about to be said in a room where everyone had fallen quiet.
“You will no longer see outcomes,” Scáthach continued. “That belongs to the gods, and even we bear it carefully. But you will see something else.”
She looked from Mary to Sean, weighing them.
“You will hear the question beneath the question,” she said. “The thing that is not asked because it is feared, or because it is not yet known even to the asker. Intuition, some would call it. I call it attention.”
“And the geas?” Sean asked.
Scáthach’s mouth curved, not quite a smile.
“That is gone,” she said. “You are free to refuse now. Which makes what you choose far more dangerous.”
Mary nodded. She understood that too.
“Use the gift carefully,” Scáthach said. “It will tempt you to answer when silence would be kinder.”
Then she opened the door herself and stepped into the cold evening, already fading into something that could not be followed.
For several days, Nether Oak Close was quiet.
The phone rang less.
No one knocked.
Mary and Sean found themselves pausing mid-sentence, waiting for answers that did not arrive and then speaking anyway.
They learned the weight of not knowing.
They learned it could be borne.
On the fourth evening, just as the light was draining from the sky, there came a knock at the door.
Not hesitant.
Not urgent.
Mary looked at Sean.
He did not ask her what she thought.
She did not tell him what she felt.
They moved together, side by side, and Mary reached for the handle.
As the door opened, both felt it, not the answer, but the shape of the question waiting to be asked.
And this time, they would choose how, or whether, to answer at all.