The woman came into my office on a Wednesday, which was good because Wednesdays were the only day of the week when I felt like I could handle other people's problems without wanting to leave the city. Thursdays I just wanted to drink. Fridays I was too drunk to care. But Wednesdays—Wednesdays I was functional.

Her name was Diana Reyes. Thirty-two, black suit that cost more than my car, eyes that had been holding back tears for too long and were now at the point where they would either fall or harden into something else. I chose not to offer her a seat because I knew she would not sit. People like her never sat—they stood, they paced, they spoke quickly and efficiently, as though their problems could be solved with enough words.

"My husband is dead," she said.

"Sorry to hear that," I said. "How did it happen?"

"He killed himself."

"People kill themselves all the time, Ms. Reyes. It is not a very interesting mystery."

"He was not the kind of man who killed himself."

"Everyone is the kind of man who kills himself. You just have to find out what pushed him."

She reached into her purse and pulled out a photograph. She slid it across my desk. It was a picture of a computer screen, taken with a phone camera. The screen was filled with equations—physics equations, I could tell that much, though I could not read them. At the bottom of the screen, in bold letters:

THE FOREST IS DARK AND EVERYONE IS ARMED. I AM THE FIRST TO DIE.

I looked at the photograph for a long time. The smoke from my cigarette curled upward and disappeared into the stale air of my office, which smelled like old coffee and older regrets.

"What is your husband's name?" I asked.

"Richard Hale. He was an astrophysicist at Caltech."

"And he wrote that on his screen before he shot himself?"

"Yes."

"Did he leave a note?"

"No. Just that."

I took another drag of my cigarette. "Who else died?"

She opened her purse and pulled out a folder. She laid seven pages on my desk. Seven names, seven dates, seven cities across four countries. Boston. Cambridge. Zurich. Los Angeles. Boston again. Tokyo. And Richard Hale, in Los Angeles.

"Six months," she said. "Seven scientists. All astrophysicists or theoretical physicists. All died by suicide. All left the same sentence on their screens."

I read the names. I read the dates. I read the locations. Something about the pattern of it bothered me, though I could not say what.

"The police?" I asked.

"Ruled all suicides. Depression, they said. Academic pressure."

"And you do not believe that?"

"I believe that seven people in six months do not all get depressed at the same time."

I flicked my cigarette into the ashtray. "What do you want me to do?"

"Find the last one. The seventh person."

"There are seven names on your paper."

"Six are dead. The seventh is alive. Find her. Before someone else kills her."

"Who is she?"

She slid an eighth photograph across the desk. A woman in her thirties, standing in front of a radio telescope, wearing a fleece jacket and jeans, with hair pulled back in a messy bun. She was smiling at something off-camera, and her smile was the kind of smile that comes from someone who has just seen something beautiful and does not yet know it will destroy her.

"Dr. Yuki Tanaka," Diana said. "She works at the Japanese National Radio Astronomy Observatory. She is the last person who has seen the signal."

"What signal?"

Diana hesitated. This was the moment—the moment where she would either tell me something that would change my life or tell me something that would make me laugh and go back to drinking.

"A signal from Proxima Centauri," she said quietly. "It contained a formula. A proof. About how the universe works."

"Like what?"

She looked at me with an expression I could not read. Not fear, not excitement, not sadness. Something in between. Something that only people who have seen too much wear on their faces.

"Like what happens when you know something that no one else can know. When you understand the structure of reality so completely that understanding it becomes unbearable."

"I am a detective, Ms. Reyes. I find missing persons and cheat spouses and insurance frauds. I do not do reality."

"You did it once," she said. "You found a missing girl in '09. You found her in a basement in Long Beach. You brought her home alive. I looked you up. I know what you can do."

I lit another cigarette. I had not told her about that case. Nobody had.

"I am going to need a check," I said.

I went to Japan.

The National Radio Astronomy Observatory was in the mountains, two hours north of Tokyo. The place was beautiful in a way that made me uncomfortable—I was not a man who appreciated beauty. Mountains, fog, pine trees—it was the kind of landscape that made you feel small and alone, which is exactly what I did not want to feel.

Yuki Tanaka was in the control room when I found her. She was reviewing data on a bank of monitors, the same kind of monitors Richard Hale had been reviewing before he killed himself. Same type of data. Same frequency range. Same direction in the sky.

She looked up when I entered the room. She did not look surprised.

"You are the detective," she said. Not a question. A statement.

"Who told you I was coming?"

"No one. I knew you were coming."

"Why?"

She turned one of the monitors toward me. On the screen was a signal—a series of waves, pulsing at regular intervals, coming from the direction of Proxima Centauri.

"Because the signal is still coming. And I know what it says. And I know that if you read it, you will understand. And if you understand, you will not want to live."

I looked at her. "You already understand?"

She nodded. "I understand everything."

"What is it?"

She was silent for a long time. Then she said: "The universe is not empty. It is full of things that do not want to be found. And the moment you find one of them, or the moment it finds you, you become part of something so vast and so indifferent that your life stops making sense."

"Like what?"

She looked at me with eyes that had seen something I could not see. "Like when you walk into a room and you realize that the silence in the room is not empty silence. It is a listening silence. It is a silence that is waiting for you to make a sound so it can decide whether to kill you. And you realize that the forest has been around you all along, and the trees have been watching, and the guns have been aimed, and you are the only one who does not know it."

She leaned forward. "The signal says: every civilization is armed. Every civilization is afraid. And the only reason the forest has not killed everyone is that everyone is too afraid to make a sound."

I took a cigarette from my pack and lit it. My hands were not shaking. That surprised me.

"So Richard Hale saw this?"

"He understood it. And understanding it was the last thing he ever did."

"And you?"

"I am still trying to un-understand it."

I smoked in silence. The monitors hummed. The mountains stood around us like guards. The signal pulsed on and on and on, a heartbeat from a dead star.

"You should leave," I said.

"I cannot. It is all I have left."

"You should leave anyway."

She nodded. "I know."

The next morning, I left Japan. Yuki Tanaka did not come with me. She stayed at the observatory, in the control room, in front of the monitors, listening to the signal from a star that had been dead for forty-two thousand years.

I did not go back. I went to Los Angeles. I went to my office. I went to my bar. I stopped drinking for three days, which was a personal record.

On the fourth day, the phone rang. It was Diana Reyes.

"She jumped," she said.

"Who?"

"Yuki Tanaka. From her apartment balcony. This morning."

I closed my eyes. I saw her smile on the photograph. I saw the signal on the monitor. I saw Richard Hale standing in front of his screen, typing the last words he would ever type, and I felt the weight of something I could not name.

"Was there a note?" I asked.

"No note."

"Just the signal?"

"Just the signal."

I hung up. I walked to my window. I looked out at Los Angeles—the rain, the neon, the endless city that had swallowed seven people and would swallow seven thousand more without ever knowing their names.

The forest was dark. Everyone was armed. And I was the only one in the room who knew it.

Which made me the most dangerous person in it.

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