Sofía found the file on a forgotten USB drive tucked inside a used book she’d bought at a street stall. The book was a worn copy of Cortázar’s Rayuela . The drive was small, red, and had no label. When she plugged it in, there was only one file:

The PDF opened, but it wasn't text. Not at first. It was a single, high-resolution photograph: a dirt road curving into a dense, green forest. The light was golden, late afternoon. It looked like the jungles of Chiapas or maybe northern Oaxaca.

She double-clicked.

She smiled at the name. It was a Thursday, and she’d been feeling stuck—trapped in her studio apartment, the same routine, the same gray sky over Buenos Aires.

The PDF hesitated. The screen went black. Then, slowly, a living room materialized. She saw herself—five years older—laughing with someone whose face was blurred. A child ran across the rug. A dog barked. The future Sofía looked directly at the screen and smiled, as if she knew she was watching.

She touched the trackpad.

She was back in her apartment. Only fifteen minutes had passed.

And somewhere deep in the machine, a file she can no longer see replies: