The rain in Los Angeles didn't wash things clean. It just made the dirt slicker.

Nick Callahan sat in his office on the fourth floor of a building that had been an office once, before the tenants stopped paying rent and the landlord stopped caring. The desk was secondhand. The chair was thirdhand. The whiskey bottle on the corner of the desk was the only thing in the room that had never belonged to anyone else.

The phone rang at eleven minutes past midnight. Nick answered on the third ring because he wasn't drunk enough to let it go to voicemail and he wasn't sober enough to care.

"Mr. Callahan?" The voice was female, smooth as silk over broken glass. "My name is Diana Voss. I need your help."

"I help people who can pay. Can you pay?"

"I can pay in information. And information is worth more than money in this city."

Nick poured himself an inch of whiskey. "What kind of information?"

"The kind that involves a man who shouldn't be alive."

An hour later, Diana walked into his office like she owned the building. She was tall, dark-haired, wearing a coat that cost more than Nick's car and a smile that cost even more. Her eyes were the color of a winter sea—beautiful and cold and full of things that could drown you.

"I was hired to find someone," she said, sitting without being invited. "A woman named Clara Chen. She died three months ago. Car accident on the 101. I've seen the death certificate. I've seen the coroner's report. She's dead."

"Then why are you hiring me?"

"Because three days after her funeral, I received a text message from her phone. It said: 'Tell Nick I need his help.' My car. I gave your card to a client. There are no other explanations."

Nick lit a cigarette. The smoke curled toward the water-stained ceiling. "You think someone is sending text messages from a dead woman's phone."

"I think nothing in this city is what it seems. And I think you're the kind of man who doesn't laugh when I say things like that."

Nick didn't laugh. He'd seen too much to laugh. Ten years on the force had taught him that the city was a machine that ground people up and spat out pieces. Five years as a private detective had taught him that some pieces were sharper than others.

"Who was Clara Chen?" he asked.

"A researcher. She worked for a private clinic called Meridian. They do... unconventional therapy. Virtual reality exposure therapy. Memory extraction. Things the FDA hasn't approved yet."

Nick exhaled smoke. "You're telling me a dead woman was doing memory extraction."

"I'm telling you she was alive three months ago and dead two months and twenty-nine days ago. And somewhere in between, she discovered something that got her killed."

Diana left a deposit—five hundred dollars in crisp bills—and a name: Dr. Marcus Webb. Clara's colleague. The last person to see her alive.

Nick found Dr. Webb in a clinic in Beverly Hills that looked more like a hotel than a hospital. The walls were white. The floors were white. The air smelled like money and antiseptic.

Webb was a man in his forties with tired eyes and hands that trembled slightly when he thought no one was looking. "Ms. Voss sent you," he said. It wasn't a question.

"She say a lot?"

"She say you're honest. I hope she's right. Because what I'm about to tell you will make you wish you weren't."

Webb led Nick to a private office and closed the door. "Aetia," he said. "It's a virtual reality therapy program. Patients enter a simulated environment where they confront their traumas in a controlled setting. It's revolutionary. It's also... dangerous."

"Dangerous how?"

"Because the traumas don't stay in the simulation. They leak. Patients who experience severe events in Aetia report symptoms in the real world—nightmares, flashbacks, paranoia. We thought it was normal. Psychological carryover. But then Clara started seeing things too. Things that weren't in any patient's treatment plan."

"What kind of things?"

Webb opened a drawer and pulled out a notebook. The pages were filled with handwriting that grew increasingly erratic. "Clara's personal logs. She was running a parallel study—tracking anomalies in the Aetia system. Glitches. Repeating patterns. And something else. She wrote that the virtual environment was... changing. Not through patient input. Through something else. Something that wasn't programmed."

Nick read the last entry. Clara's handwriting had devolved into something almost illegible: "They are not patients. They are fragments. The system is not treating trauma. It is creating it. And the source is not external. It is internal. Marcus is not who he says he is. None of us are."

"Who is Marcus?" Nick asked.

Webb's hands were shaking harder now. "That's what I'm trying to find out. And that's why you're here, Mr. Callahan. I need you to enter Aetia."

Nick stared at him. "You want me to play in your magic video game?"

"I want you to enter it as a patient. Find Clara's data. Find out what she discovered. And find out if she's really dead—or if something in that system has made her something else."

Nick finished his whiskey. The ice had melted. The glass was empty except for a few watery drops that looked like tears if you were feeling sentimental, which he wasn't.

"Two thousand dollars," he said. "Half now. Half when I come back."

Webb nodded. "Done."

That night, Nick Callahan put on a headset and closed his eyes. The world went dark. And when he opened them again, he was standing in a city that looked like Los Angeles but wasn't. The streets were the same. The buildings were the same. But the shadows were wrong. They moved when he wasn't looking directly at them.

A woman stood at the end of the street. Dark hair. Long coat. She turned, and her face was Diana's.

"Nick," she said. "You shouldn't have come."

Then she was gone. And the city breathed around him, waiting, watching, remembering things that had never happened.