The crack appeared the morning after the storm.
Nadia noticed it while she was still in her pyjamas, standing in the doorway of the old scullery with a piece of toast in her hand. A thin dark line had split the plaster above the kitchen fireplace, running from the top of the mantelpiece to the ceiling like a fault in the earth. She told herself it was nothing — old houses creak and shift in heavy weather. But something made her cross the cold flagstone floor and press her fingertips against the wall.
The plaster moved. Not by much — barely a centimetre — but it gave, as if something hollow lay behind it.
Nadia set down her toast and pressed harder. A section of plaster the size of a hardback book came away in her hands, releasing a smell of dust and something older she couldn't name — dry and faintly sweet, like the inside of a grandmother's wardrobe. Behind the plaster, tucked into a cavity barely deep enough to hold a hand, was a folded square of paper so dark with age it was almost the colour of the stone.
She carried it to the kitchen table and unfolded it with the tips of her fingers, terrified it would crumble. It held. The paper was thick — the heavy, fibrous kind she had only ever seen in museums — and covered on one side in a dense, looping script she couldn't read. On the other side was a map.
It showed a building she didn't recognise: a large rectangular shape divided into smaller rooms, with a courtyard drawn at one end and what appeared to be a well in its centre. North was marked with a compass rose that bore eight points rather than four, each tipped with a different symbol. Along the bottom of the map, three lines of text had been written in the same impossible script, and beside them someone had sketched — very faintly, as if done quickly — the outline of a key.
Nadia sat for a long time, not moving.
The building on the map was not Moorfields House. She was certain of that. Moorfields House had been built in 1892; she had read the plaque above the front door a hundred times. Whatever was shown on this paper was far older — she could see it in the proportions of the rooms, the shape of the windows, the way the courtyard dominated the centre of the plan. And whoever had hidden the map here had wanted it to stay hidden. The section of wall had been plastered over with care: the paper was protected, the cavity neat and deliberate.
She turned the map over and looked again at the script, willing it to make sense. Some letters seemed almost familiar — close enough to something she had seen before — but every time she thought she recognised a word, it slipped away.
Her uncle's car crunched on the gravel outside.
Nadia folded the map quickly and pressed it flat against her stomach under her jumper, her heart hammering. She didn't know why she hid it. She only knew that she wasn't ready to share it — not yet, not until she understood what she was looking at.
The back door opened. Cold air came in from the yard.
'Morning,' said her uncle cheerfully. 'Sleep well?'
'Fine,' said Nadia. Her voice came out steadier than she expected.