The rain hadn't stopped in three days. It wasn't even a proper rain—more like a persistent drizzle that seeped into your bones and made you question every life choice that had led you to a city where the sky was permanently the color of a wet sidewalk. I was sitting in my office on Canal Street, watching water trace lazy paths down the windowpane, when the envelope appeared.

No delivery boy. No knock on the door. Just an envelope, slipped under my door like a note in a prison movie, containing a single sheet of paper with three words typed on it:

Design it for me.

I should have thrown it away. I should have called the police. Instead, I called the number listed at the bottom of the page, because that's what men like me do—we call the number.

The voice on the other end was male, age indeterminate, accent impossible. "Mr. Morrow," it said. Not "Who is this?" Not "How did you get this number?" Just "Mr. Morrow," as if it had been expecting me to call, as if it had been sitting on the other side of the line, watching me read the note, waiting for the inevitable.

"I have a project," the voice said. "It requires a designer with your particular... flexibility."

"I don't know what you're talking about."

"You do. You've been doing this work for six years. You just don't like to think about it while you're doing it."

I thought about it anyway. "What kind of project?"

"A vessel. Submarine. Specific requirements."

"Who's it for?"

"The same person who's going to use it." A pause. "You'll receive specifications by mail. Build it to spec. You'll be paid in full upon delivery. Payment is already in escrow."

"How much?"

"Enough that you won't ask questions. And Mr. Morrow—don't ask questions. You've always made your living by not asking questions. This is no different."

The line went dead.

Two days later, the specifications arrived. They were detailed—painfully detailed. A submarine design unlike anything I had ever seen. Not a military design, not exactly. It was faster than any attack submarine of its class, quieter than any submarine that had ever been built, and it had a feature that made me put the papers down and stare at the ceiling of my office for a long time: a forward-facing torpedo tube system designed for rapid, sequential launches from concealed positions.

It was a hunting design. Not a warship. A hunter.

I built it. Not because I believed in whatever cause the anonymous client was pursuing, but because the money was real and the challenge was real and I had rent to pay and a bottle of rye on my desk that needed company. My design studio in Jersey City became my world. I ate there. I slept there. I lived in the blueprints the way a sailor lives in his ship—breathing them, dreaming them, forgetting that there was a world outside the lines and calculations and stress tests.

The work was good. It was the best work I had ever done. And that was the problem, because I knew—knew with the certainty of a man who had spent his life building weapons—that this design would kill people. Not in a war. Not in a battle. In the dark, quiet way that hunting designs kill people: from behind, without warning, without the messy complications of flags or declarations or honor.

I told myself it wasn't my problem. I had a rule: I never asked who the client was or what the design was for. It was the only rule that had kept me alive for six years. I intended to keep it.

But rules, like ships, have a way of turning on their creators.

It started with the details. Small things, at first. The client's specifications included references to specific harbor layouts—harbors I recognized not from charts or maps but from memory. I had served in the Navy. I knew the layout of every major naval base on the East Coast. And the client's specifications included exact measurements of the anchorage at Norfolk, the patrol patterns at Newport, the depth contours off Cape Cod.

These weren't measurements you could get from a public chart. These were measurements you got from someone who had been inside these places, who had walked these waters, who knew them the way a man knows the streets of his neighborhood.

Me.

I knew them because I had helped design the defense systems for half of them.

The second thing was the timing. The client's specifications called for a delivery date that coincided exactly with a scheduled Navy exercise—a massive fleet maneuver that would concentrate the entire Atlantic fleet in a relatively small area of the Atlantic, three hundred miles off the coast of North Carolina.

It was like the client knew about the exercise. Which, given who I worked for in the Navy intelligence community before I went private, meant that the client probably knew everything.

I should have stopped then. I should have packed my things, walked out of the studio, and never looked back. But I didn't. I kept designing. Because the money was good, and the challenge was good, and because deep down, in the part of my brain that I preferred not to think about, I was curious.

Curious about what I was building. Curious about who was paying for it. Curious about what would happen when it was finished.

The third thing was the name. The client never gave me a real name, but they gave me a designation for the project: SHADOW-7. Seven, because it was the seventh design I had built for them. And with each design, the work had gotten more specific, more detailed, more... personal.

The first project had been a cargo ship design—innocuous enough. The second had been a patrol boat. The third, a ferry. The fourth, a minesweeper. The fifth, a transport. The sixth, a reconnaissance vessel. And the seventh—a hunting submarine.

Each design had gotten closer to the center of whatever target the client was pursuing. Like a man circling his prey, getting closer with each lap.

I finished SHADOW-7 in the spring of 1948. It was a beautiful piece of work—cold, efficient, lethal. I delivered the blueprints to a drop box in Brooklyn, and two days later, the escrow released the final payment. I counted the money and felt nothing. Not satisfaction. Not guilt. Nothing. Just the hollow, echoing emptiness of a man who had sold a piece of his soul and didn't even have the decency to feel bad about it.

That night, I went to a bar on Mulberry Street—a place called The Blue Note, where the jazz was good and the whiskey was cheap and the patrons were the kind of people who didn't ask questions. I ordered a drink and sat at the bar and tried to forget about SHADOW-7.

Then a woman sat down next to me. She was young—late twenties, maybe thirty—with dark hair and dark eyes and a cigarette in a long holder that she smoked with the practiced ease of someone who had been smoking for most of her adult life.

"Jack Morrow," she said. Not a question. A statement.

"That's right."

"I'm Vivian Cross."

I recognized the name. Vivian Cross was a singer at The Blue Note—well, she had been, before the club closed and reopened and closed again. She had a voice like honey poured over broken glass, and she had been my girlfriend, briefly, during a period of my life that I preferred not to remember.

"Vivian," I said. "How are you?"

"Alive. Unfortunately." She took a drag from her cigarette and looked at me with those dark eyes. "You've been busy, Jack."

"I don't know what you mean."

"Don't you?" She leaned closer. "I know who you've been working for. I know what you built. And I know what it's going to be used for."

I felt a coldness spread through my chest. "Who are you talking about?"

"The man who hired you. The man who's been hiring you for six years. He's not who you think he is, Jack. None of this is what you think it is."

"Then what is it?"

She looked at me for a long moment, and I saw something in her eyes that I hadn't expected: pity. "You're being hunted, Jack."

The words hit me like a physical blow. "What?"

"The submarine you built—SHADOW-7. It wasn't designed for a foreign navy. It wasn't designed for a criminal organization. It was designed for you."

I laughed. It was a dry, humorless laugh. "You're saying I designed a submarine to hunt myself?"

"Not a submarine. A man. The specifications you received—they included personal data. Your patrol routes. Your schedule. Your habits. The places you go. The bars you drink in. The streets you walk home on." She paused. "Someone knows you, Jack. Someone who knows you better than you know yourself. And they've built a weapon specifically designed to find you."

I stared at her. "Who?"

"I don't know his name. But I know what he calls himself." She took another drag from her cigarette. "The Engineer."

The name meant nothing to me. It shouldn't have. But it did. It meant something—something deep and dark and primal, the way a nightmare means something to a man who can't quite remember what caused it.

"The Engineer," I repeated.

"He's been building weapons for six years. For everyone. For everyone who can pay. And for the last six years, he's been building something else—something he never told anyone about. A pattern. A map. Of every weapon he's ever designed, every client he's ever served, every target he's ever helped create."

She leaned back in her seat and looked at me with those dark, knowing eyes. "And the final target on his map is you, Jack."

I left the bar that night and walked home through the rain, thinking about SHADOW-7, thinking about The Engineer, thinking about the simple, terrible truth that I had spent six years building my own death sentence and called it a paycheck.

I never found The Engineer. I never found Vivian, either. But sometimes, when I'm walking home on a rainy night and I hear the sound of water on the pavement and I think about the man I used to be and the man I became, I wonder if he's still out there, in some dark corner of some dark city, designing the next weapon, building the next pattern, hunting the next target.

And I wonder if the next name on his map might be mine.