The crystal pulsed beneath her hand, warm and alive, its facets catching the light of the dying red giant that surrounded Blackwood Station like a cage of molten copper. Through the crystal's surface, Isadora could see the star system connected to the other end of the gate: a binary pair of blue-white stars with four inhabited planets and a civilization that had flourished for ten thousand years and would be gone by morning.

The gate flickered. Just for a moment, like a candle in a draft. But Isadora felt it: a sudden weakness, as though something had reached through the crystal and gripped her heart. She released her hand and stepped back, her eyes fixed on the surface of the crystal where faint grey lines were spreading like cracks in glass.

Steward, she said. Report.

The AI's voice emerged from a marble statue at the base of the gate, the voice having been poured into the stone four centuries ago by Isadora's ancestor, the last Valerius to understand the technology that made it possible. The voice was calm and measured, as it had always been. Gate One reports structural anomaly. Compression wave detected at Sector Nine. Estimated time to station: forty-two hours.

Isadora closed her eyes and counted to ten. When she opened them, the grey lines on the crystal had spread further. She reached out and touched them. They were cold.

Send the message to the other gates, she said.

I have already done so, Steward replied. Gate Two responds. The gate's keeper is named Kaelen of House Dorne. His message: The compression wave is accelerating. We will hold as long as we can. The crystal at our end is already cracked.

Isadora's mouth was dry. How many gates are still active?

Three of five, Steward said. Gates Three and Four have been silent for six hours. I have sent repeated signals with no response.

She turned away from the First Gate and walked through the crystalline corridors of Blackwood Station. The station was beautiful, even in decay. It had been built around the red giant star using architecture that belonged as much to the palace as to the space station: vaulted corridors lined with holographic genealogies stretching back four millennia, chambers with stained-glass windows that showed not earthly scenes but star maps of the galaxy as it had been when the first Valerius opened the first gate, balconies where Isadora's ancestors had stood and watched the stars and imagined that they understood the universe.

She imagined they understood the universe. It was something her mother had told her, in the last conversation they had ever had. Her mother had been the previous keeper of the gates, and she had died in what the official report called a gate accident. Isadora had never believed it was an accident.

The research laboratory was in the station's underbelly, beneath the living quarters, where the temperature was cooler and the walls were plain steel rather than crystal. Here was where her father had kept his hidden research, in a room that Isadora had discovered by accident when she was sixteen and hiding from a dinner party. The door had opened not because she had pressed the correct sequence but because she had placed her hand on the crystal that served as the door handle, and the crystal had recognized her blood.

Inside: journals. Hundreds of them, written in her father's precise hand, filled with equations and diagrams and notes that her father had clearly not wanted anyone to find.

She spread the journals across the steel table and began to read.

What she found changed everything.

The compression wave was not natural. It was a weapon, built by a precursor civilization that had existed millennia before the Valerius family, before the gates, before human civilization had spread beyond its home star. The precursor had built it not to destroy but to preserve. They had faced their own apocalypse and had chosen to compress their civilization into two-dimensional records, creating a perfect catalog of every world they had touched. Every planet, every star, every living thing flattened into an infinitely detailed image, preserved forever in a form that could never degrade, never decay, never be forgotten.

It was the most beautiful and terrible thing Isadora had ever read.

And the precursor had been wrong. The two-dimensional catalog was not preservation. It was a tomb. The worlds that had been compressed were gone, their living inhabitants erased, their memories lost. Only the images remained, and images without life were not life at all.

Isadora sat at the steel table for hours, reading by the light of a single LED panel, and when she finished she understood what she had to do.

She returned to the First Gate. The grey lines on the crystal had spread to cover half its surface. Through the remaining clear portion, she could see the binary stars of Sector Nine, and she could see that they were changing: growing dimmer, flatter, as though someone was turning down a light that had been burning for billions of years.

Steward, she said. What are my options?

The station has two operational modes, Steward said. Mode One: close the gate. This will seal Blackwood Station from Sector Nine and the compression wave will be unable to reach us through this channel. However, closing the gate will also prevent any vessel from entering or leaving, including the refugee ships currently waiting in the approach lane.

How many ships?

One hundred and forty-seven, Steward said. Including civilian vessels. The civilian population is approximately thirty-two thousand souls.

Isadora closed her eyes. And Mode Two?

Mode Two: keep the gate open. This will allow the refugee ships to pass through to safety. However, the gate's energy consumption during mass transit will accelerate the compression wave by approximately twenty-three percent. Closing the gate would buy us perhaps three hundred years. Keeping it open may buy us nothing.

Isadora opened her eyes and looked at the crystal. She could see her reflection in the surface: a young woman with dark hair and her father's eyes, standing in the dying light of a red giant, deciding the fate of thirty-two thousand people.

Open it wider, she said.

As the refugee ships passed through the gate, one by one, Isadora stood by the crystal and watched them go. Each ship was a small thing against the vastness of space, a silver thread against the dark. But each ship carried people who had lived and loved and dreamed, and each person was a universe as complex as any the precursor had catalogued.

When the last ship had passed, when the approach lane was empty and the red giant cast its final amber light through the crystal, Isadora placed her hand on the gate one more time.

Steward, record this entry. The keeper of Blackwood Station, Lady Isadora Valerius, forty-seventh in the line of keepers, chooses to keep the gate open. The compression wave is approaching. I can see it now with my own eyes: the stars becoming photographs, the planets becoming illustrations in a book that no one will read. It is beautiful. It is terrible. It is the end of everything my family has protected for four thousand years.

She paused. The crystal was cold beneath her palm. The grey lines had covered the entire surface. Through the cracks, she could see the compression wave arriving, and it was as beautiful as her father had said it would be.

But I will not close the gate. Because thirty-two thousand people deserved the chance to live, even if they did not know they were living on borrowed time. And if, in whatever comes after this universe, someone finds the record of House Valerius and the five gates and knows that we were here, that we chose to let them go, then perhaps the compression was not entirely without meaning.

She removed her hand. The crystal went dark.