The machine in the basement is just a chair, a screen, and a thin needle of cold blue light. Mara built it from her dad's old notes after the funerals. Seven times this week she has watched her brother Eli die. Every loop ends the same way: the river behind the highway takes him before she can shout his name. Tonight the screen shows a glowing thread for each day. One thread is Saturday afternoon. She can cut it like a loose stitch. Her hand hovers over the light.

Mara cuts the thread. The needle hums and the basement flickers. When the light steadies, the calendar on the wall reads Sunday. Saturday afternoon is just gone, like it never happened. She runs upstairs shouting Eli's name. He answers from the kitchen, alive, eating cereal. It worked. But he frowns at her and says, 'Why are you crying? Who's Eli?'

Mara grabs the cereal box and points at the photo on the fridge: her and Eli at the lake, both grinning. But in the photo, she's alone now. Just her, holding nothing. Cutting Saturday didn't only save him. It erased him from everyone's memory but hers. She's the only person who knows Eli is her brother.

Mara decides being the only one who remembers is a price worth paying. Eli is alive. That's what matters. She keeps his photos in a shoebox under her bed and never tells him the truth. Years later, an old man at his wedding asks who she is. 'I'm his sister,' she says. Nobody else knows it's true, but she does, and that's enough.