Julian Cross first predicted a death on a Tuesday in October, 1923. He was twenty-eight years old, working as a junior physicist at Princeton, and he had just finished calibrating the Chronoscope, a device he had built in his garage from scavenged parts and theoretical insights that his colleagues dismissed as fantasy.

The Chronoscope did not predict the future in the way that fortune tellers did. It calculated it, using quantum mechanical principles that Julian had derived from a synthesis of Heisenberg's uncertainty principle and Schrödinger's wave equation. In essence, the device measured the probability waves of future events and collapsed them into a single outcome.

That Tuesday, the Chronoscope predicted that Dr. Richard Hale, a senior colleague in the physics department, would die of a heart attack at 4:17 PM. Julian checked his work three times. The probability was 99.7 percent. He did not believe in coincidences, but he also did not believe in interfering with the natural order. He went to lunch.

At 4:17 PM, Richard Hale collapsed in the faculty lounge. He was dead before he hit the floor.

Julian felt a cold dread settle in his stomach. He had predicted a death, and it had happened exactly as foretold. But then something worse happened: he realized that his prediction had changed the outcome. Richard Hale had been healthy. The Chronoscope had not predicted the death because it was inevitable. It had predicted the death because Julian had built the device, and the device had measured the quantum probabilities, and the measurement had collapsed the wave function into a single outcome.

Julian had killed Richard Hale by predicting it.

He spent the next six months in a state of near-constant anxiety, running simulations, testing the limits of the Chronoscope, and trying to understand the paradox that was slowly destroying his life. The paradox was simple and devastating: the act of prediction changed the future. The more precisely he predicted, the more he altered what was about to happen. It was as if the universe was a house of cards, and every time Julian looked at it, he blew it over.

Celeste Duval found him in December, sitting on a park bench in Central Park, staring at the Chronoscope as if it were a live grenade. She was a French artist who had come to New York to escape the shadows of the Great War, and she painted the futures that Julian destroyed.

"You look like a man who has seen the end of the world," she said.

Julian told her about the Chronoscope. He told her about Richard Hale. He told her about the paradox.

Celeste listened without interrupting. When he finished, she picked up a piece of charcoal from her bag and began drawing on a napkin. She drew a picture of Julian sitting in his garage, surrounded by wires and vacuum tubes, looking at a device that was slowly eating his soul.

"I will paint your futures," she said. "And you will see what you destroy."

They fell in love in the spring of 1924, during the season when the cherry blossoms bloomed in Washington Park and the jazz bands played on every corner of Greenwich Village. Julian moved to Paris, where he joined the expatriate community of Hemingway, Fitzgerald, and Stein. He continued to work on the Chronoscope, improving it, refining it, trying to find a way to predict without altering.

Celeste painted. Her canvases grew darker with each passing month. She painted the futures Julian had destroyed: a man falling from a bridge in Vienna, a woman drowning in the Seine, a child struck by a car in Long Island. Each painting was a testament to Julian's power and his curse.

In 1927, Julian discovered that the Chronoscope could predict its own predictions. If he ran the device twice, the second prediction was always different from the first, because the first prediction had changed the future. The paradox was recursive, infinite, and ultimately unsolvable.

The stock market crash of 1929 was the worst of all. The Chronoscope predicted it three months in advance. Julian tried to warn people, but he knew that if he revealed the source of his knowledge, the prediction itself would alter the outcome and make it worse. So he stayed silent. He watched as millions of people lost everything. He watched as the prosperity of the Jazz Age collapsed into dust and despair.

Celeste painted the crash. Her canvas was a swirling vortex of red and black, with figures falling through a sky filled with falling numbers. Julian stood in front of it and wept.

In 1931, Julian returned to New York. He was thirty-three years old, and he had not slept properly in eight years. He went to his garage, took the Chronoscope apart, and threw every piece into the Hudson River. He watched the wires and vacuum tubes sink beneath the dark water and felt a relief so profound it was almost painful.

He walked to a jazz club on 52nd Street. The saxophone was playing, and the dancers were spinning, and the champagne was flowing. Julian ordered a drink and sat in the corner and let the music fill the silence in his head.

He did not know what would happen tomorrow. He was grateful for it.

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