The rain in Los Angeles does not wash things clean. It makes everything wetter. That is all it does. It turns the dust on the sidewalk to mud, the mud to soup, the soup to something that smells like the inside of a garbage can on a July afternoon. I stood under the awning of my office door and watched the rain do its useless work, thinking about the woman who had walked into my office three days ago and left a USB drive on my desk and then walked back out into the rain and never came back.

Her name was Victoria Cross. She was thirty-two, maybe, with eyes that had seen something they could not unsee and a voice that had learned to hide it. She put the drive on my desk and said: Investigate this. Then she left. That was the job. That was always the job.

The drive contained data. Not music, not video. Something else. A series of pulses, rhythmic, repeating, with a pattern that was too regular to be random and too complex to be natural. I showed it to nobody. I do not show things to nobody. That is how you get people killed in this city.

I started with the obvious sources. NASA. JPL. The NSA. All of them denied anything unusual. All of them said the data looked like "interference" or "equipment malfunction." Professional denials. The kind you practice in front of a mirror until they sound convincing.

But I had been FBI before I was a PI. I knew denial when I heard it. And I knew that when a government agency tells you something is interference, the first thing you do is find out who is paying for the equipment that is picking up the interference.

The equipment was in Maryland. NSA facility. Project name: Echo. I found that through a contact at the Pentagon who owed me a favor, which is a currency that is always in circulation in Washington even when everything else has crashed.

Echo was not what I expected. It was not a listening post. It was a broadcasting station. A very expensive, very secret broadcasting station that had been transmitting signals into deep space for the past eighteen months. The signals were not mathematical sequences or peaceful greetings or the kind of thing you see in science fiction movies. They were something else entirely.

I spent two weeks digging through public records, FOIA requests that came back redacted to the point of unreadability, and conversations with people who talked when they had had too much whiskey and forgot who I was. Slowly, a picture emerged.

Echo was not trying to contact alien civilization. It was trying to guide it.

The signals contained coordinates. Not random coordinates. Specific coordinates. Earth coordinates. Strategic locations, resource deposits, population centers. It was not a hello. It was an instruction manual. A how-to guide for finding this planet.

I sat in my office at 2 AM, staring at the printouts spread across my desk, and I felt the kind of cold that has nothing to do with temperature. Someone in this government was trying to lead aliens to Earth. Not contact them. Lead them here.

I needed to talk to someone inside Echo. Someone who knew what they were doing. And I knew exactly who that was.

Dr. Richard Hale was the lead analyst on the Echo project. Forty-five years old, NSA, top security clearance. I found his home in Bethesda, a modest house with a well-kept lawn and a car in the driveway that cost more than my office. I knocked at ten o'clock at night. He opened the door in a bathrobe, looking tired and suspicious.

When I told him who I was and what I knew, he did not deny it. He just looked at me with eyes that were empty in a way that frightened me more than any lie could have.

"You think we are crazy," he said. It was not a question.

"I think you are doing something that has no name."

He closed the door. I stood in the rain for a minute, then walked back to my car.

Two days later, Victoria Cross called me. Her voice was different this time. Not hidden. Not afraid. Just tired.

"They are going to kill me," she said. "I know that. But I need you to know the truth before they do."

"What truth?"

"The Echo project is not a government project. It is a group. A small group of people inside the intelligence community who believe that humanity cannot survive on its own. That we are too destructive, too short-sighted, too stupid to make it to the next century. So they decided to get help. External help."

"From aliens."

"From anyone. They do not care who comes. They just want someone to come and fix what they think is broken."

"Fix it?" I said. "You mean invade."

"Same thing, different vocabulary."

She hung up before I could respond. I sat in my car in the parking lot of a Denny's on Sunset Boulevard, listening to the rain hit the windshield, thinking about the woman who had trusted me with information that was probably going to get her killed.

I went to see Ramirez. He was my old partner at LAPD, and he was the only person I knew who still had some honesty left in him, even if he did not know what to do with it.

I found him at a bar in Boyle Heights, drinking a beer and reading the sports section like the world was not falling apart. I sat down across from him and told him everything. The USB drive. Echo. The coordinates. The group inside the government that wanted aliens to come and fix the world.

He listened without interrupting. When I finished, he put down his beer and looked at me for a long time.

"Jack," he said. "You have been drinking too much."

"I wish I was."

"Aliens. Come on, man. You used to be better than this."

"I am not asking you to believe me. I am asking you to look at the data."

He shook his head. "I am not looking at any data. I have a murder case on my desk. A body in the San Gabriel River. That is real. This..." He waved his hand at me. "This is your alcoholism talking."

I paid for my drink and left. Outside, the rain had stopped. The city was wet and shiny and indifferent, the way it always was.

I went back to my office and sat at my desk and looked at the USB drive. It was small. Black. Unremarkable. The kind of thing you find in a drawer and throw away. But inside it was enough information to change everything. Or nothing. Depending on who you asked.

I picked up the drive and put it in my pocket. Then I picked up my glass and poured another drink. The rain started again outside, tapping against the window like someone trying to get my attention. I ignored it. I had learned that lesson a long time ago. Some things knock on your door and some things knock on your window and some things knock on the walls of the world and ask if anyone is home.

And the answer, most of the time, is nobody.

I drank the whiskey. I watched the rain. I waited for nothing in particular.