The lighthouse beam swept across empty ocean, its rhythm unchanged for forty years. Sarah knew this because she'd counted every rotation since her grandmother died three months ago, leaving her the keeper of more than just the light.
The letters arrived in grandmother's handwriting, one each week, postmarked from impossible places.
Venice, 1962. Damascus, 1978. Tokyo, 2043.
Tonight's envelope sat on the keeper's desk, its stamp depicting a flower that wouldn't exist for another decade. Sarah's hands trembled as she broke the seal.
Dearest Sarah,
By now you've realized the lighthouse doesn't just guide ships. The mechanism in the eastern chamber—the one I told you never to touch—opens doors between moments. I've been walking through time since before you were born, collecting debts, keeping promises, preventing disasters you'll never know almost happened.
But there's a price. Every journey forward costs a day backward. I'm running out of days, my darling. The last door I opened was 2026, January 22nd. I saw you reading this letter.
The mechanism will call to you soon. When it does, you must choose: lock it forever and live one linear life, or step through and inherit my burden. There's a third option I never told anyone.
The letter ended there, the signature incomplete, as if grandmother had been interrupted mid-stroke.
Below, in the eastern chamber, something began to hum.
Sarah descended the spiral stairs, each step echoing her heartbeat. The mechanism was older than the lighthouse itself, brass and glass and materials she couldn't name. Its surface rippled like water, showing fragments of scenes: herself as a child, grandmother young and laughing, strangers in impossible cities.
The humming grew louder. In the rippling surface, she saw grandmother standing in the same chamber, reaching toward her.
Not a memory. Not the past.
Now.
"Choose quickly," grandmother's voice echoed from everywhere and nowhere. "The door between us closes in three minutes. Come through and I'll show you the third option. Or walk away and I'll understand."
Sarah's reflection in the mechanism showed two versions of herself: one turning back toward the stairs, one reaching forward.
The lighthouse beam swept on, indifferent to impossible choices.
Two minutes remained.
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