On a sweltering August afternoon in Olszyn, Lena, Kacper, and Maks find a hidden letterbox beneath an old oak tree and receive an invitation that pulls them into the night.
August in Olszyn pressed down like a heavy hand. The town smelled of sun-warmed dust, cut grass, and apples ripening in the orchard gardens along the edge of the estate. Lena, Kacper, and Maks had spent most of the summer drifting from one dull idea to another, too restless to sit still and too bored to know what to do with themselves.
They ended up, as they often did, beneath the great oak at the crossroads park. Its branches spread wide over the path, throwing a patch of cool shadow over the roots. Lena stood with her hands on her hips, hair coming loose from its tie, already scanning the ground as if the answer to their boredom might be hiding in plain sight. Kacper, quieter than the others, watched everything as though he expected it to matter. Maks, younger and impossible to slow down, kept poking at anything that looked breakable.
Lena spotted it first.
Something green was tucked between two roots, almost swallowed by moss. She crouched and scraped it free with her fingertips. It was a small metal letterbox, old-fashioned and brass-edged, painted a faded green that had flaked away in places. A narrow slot ran across the front. Beneath it, carved into the metal in careful, slanting letters, were the words: For those who can listen.
"Have you ever seen that before?" Lena asked.
Maks leaned in, grinning despite himself. "No. But if it’s hidden under a tree, it has to be good. Maybe it’s a secret stash."
Kacper brushed moss from the side of the box. "My grandfather used to talk about a postman's alley near here," he said slowly. "He said old boxes were once put up all over town. Some of them were never taken down."
Lena didn’t answer. She was already tearing a corner from the paper in her pocket. On it, she wrote: Hello. We found you. Who are you?
She folded the note once, twice, and slipped it through the slot.
Nothing happened.
The three of them waited anyway, listening to the wind move through the oak leaves overhead. A storm rolled through that night, rattling windows and rattling the town awake, and by morning the park was washed clean and shining with mist. When they came back, the box was still there, damp with dew, the brass dark against the green paint.
Only now a tiny key hung beside the slot, where no key had been before.
Lena touched the lid. There was a faint click, so quiet she almost thought she imagined it. The top lifted on its own.
Inside was no letter, no folded note, no crumpled paper. Only a single green leaf, fresh as if it had just been plucked from the tree above them. Across its surface, something had been carved into the flesh of the leaf in thin, sharp lines:
Come at midnight. Bring a light. Only the three of you.
Maks went very still. Kacper looked up at the branches overhead, and for one strange second Lena had the feeling that someone, or something, was waiting just beyond the trunk, listening to every breath they took.