The jazz was bleeding through the floorboards of the Harlem basement when Eleanor Voss pushed through the back door with a bucket of ice water. The trumpet player never stopped. Nobody ever stopped. That was the thing about this club—it ran on something stronger than electricity, something that drained you and filled you up at the same time.

Maya Washington stood at the microphone, her back to the wall, and sang a song that hadn't been written yet. Eleanor watched from the kitchen doorway, her apron stained with beer and dishwater, and felt that familiar pull in her chest—the one that had nothing to do with love and everything to do with something she couldn't name.

"Another bucket, Ellie?" Maya said when the set ended, wiping sweat from her forehead with the back of her hand.

"Always," Eleanor said.

She was twenty-six, assistant technician at a biolab in Brooklyn that billed itself as a research facility but was mostly a front for Chronos Corporation's secret division. Eleanor didn't know all the details, but she knew enough. The Life-Extension Serum they were developing—three million dollars a dose, enough for one rich person on Long Island to buy a decade of extra life—was something her hands had helped create.

Three weeks ago, she had found something. In the sequencing data, buried under pages of failed iterations, a pattern that shouldn't have existed. A shortcut. The core compound could be synthesized from common amino acids through a catalytic process she'd seen in an organic chemistry textbook she'd been reading on the subway. The formula was in her head now. She could write it down.

She hadn't told anyone.

That night, she sat in her apartment above a laundromat on 125th Street, a pencil and a pad of notebook paper on her knee, and tried to write the formula. She got halfway through the molecular chain before her hands shook too much. She put the pencil down and stared at the wall.

If she sold it to Chronos, she'd get enough money to buy both herself and Maya a dose. Two hundred years. They could leave New York, go somewhere with trees and quiet, and never look back.

If she published it—if she gave it to the independent scientists Dr. Chen had been quietly assembling—they'd be able to mass-produce it. The price would drop. Not to free. Maybe not even to cheap. But affordable. For the first time in human history, more than a hundred people would get a chance at more than their natural allotment.

Eleanor picked up the pencil. Put it down. Picked it up again.

By morning, she had made her decision. She copied the formula onto three separate pages, locked them in the laundromat's safe (the one the owners used for deposits), and went to work.

At the lab, Dr. Chen was waiting for her when she got home that afternoon. He stood in the hallway outside her apartment, smoking a cigarette even though smoking wasn't allowed in the building.

"You've been working late," he said. It wasn't a question.

"I'm a scientist," Eleanor said. "I work late."

Dr. Chen looked at her for a long moment. Then he said, "There's a network. Independent researchers. We have people in Chicago, London, Tokyo. If you have something—anything—we can move fast. But you have to trust us."

Eleanor said nothing. She thought about Maya's voice in that basement, singing songs that didn't exist yet. She thought about the three million dollar price tag. She thought about the formula on her pad, trembling in her hands.

She went inside, got the pages from the safe, and handed them to Dr. Chen.

Three days later, the formula was being printed on cheap paper and distributed through underground channels. By the end of the week, three independent labs had verified the synthesis process. By the end of the month, the cost of Life-Extension had dropped from three million dollars to twelve thousand.

Chronos Corporation sued everyone. Nobody cared.

Eleanor stood on the corner of 125th and Lenox Avenue, watching flyers spiral through the air like paper birds, and felt something she hadn't expected: not triumph, not satisfaction, but a quiet kind of grief.

Maya had left for Paris two days ago. She'd called from the airport. "Ellie, I can't. I won't take it. What's the point of two hundred years if I'm living a life I didn't choose?"

Eleanor had said nothing. She was still saying nothing, even now, watching the flyers flutter down onto the sidewalk, onto the heads of strangers who would read them and live longer because of what she had done.

She picked up a flyer from the ground. It showed the molecular structure of the shortcut, handwritten in her own neat laboratory script. For a moment, she thought she saw Maya's face in the crowd below—the jazz singer turning the page, singing something new.

Then a taxi splashed through a puddle, and the flyer was soaked, and the formula was unreadable, and Eleanor Voss walked home alone through the streets of Harlem, carrying nothing but the knowledge that she had changed everything, and lost something she couldn't name.