The wall between Section 26 and Section 7 had been there for seventeen years, and for seventeen years, nobody had tapped on it.

Until I did.

I tapped in the rhythm my mother used to tap when she was cooking—three quick strikes, a pause, two slow ones, a pause, three quick again. It was a rhythm from Brooklyn, from before the train, from when I lived in a one-bedroom apartment above a laundromat and my mother made Sunday gravy on the stove and the sound of it bubbling was the closest thing to music she knew how to make.

I tapped it because I didn't know what else to do. I tapped it because I had been thinking about it all day—the rhythm, the gravy, the way my mother used to say that life was like Sunday sauce: you had to let it simmer and you couldn't rush it and sometimes it came out bitter and you ate it anyway.

Then, from the other side of the wall, came a response.

It was a piano note. A single, clear note, like a bell struck in an empty room. Then another. Then a chord. Not the rhythm I had tapped, but something built on it—something that took my three-two-three pattern and wrapped it in harmony, like a voice taking a simple melody and making it beautiful.

I stood there, my hand against the wall, and I listened.

She was good. She was very good. And she was in Section 7, the first-class jazz salon, where people wore suits and drank whiskey and listened to music that cost more than my mother made in a month.

I tapped again. A different rhythm this time. Something I had made up—a rolling, syncopated beat that sounded like footsteps on a Brooklyn sidewalk. She answered with a running scale, fast and bright, like water flowing over stones.

I smiled. For the first time in seventeen years, I felt something move through me that wasn't grief or anger or hunger.

It was interest.

Her name was Clara Ashworth. I learned it a week later, when the wall between our sections became less of a barrier and more of a conversation. She played for me. I tapped for her. She learned my rhythms and wove them into her music. I learned her scales and tapped them on the wall until my knuckles were raw.

"You're from the tail," she said one night, through the wall. Her voice was softer than her playing—less certain, more careful, like a person who is used to being heard and is surprised to be speaking to someone who might not listen.

"Yes," I said.

"My family says you people in the tail are barbarians."

"My family says your family eats people who don't tap back."

She laughed. It was a good laugh. It sounded like the kind of thing that should have been impossible on a train that had been running for seventeen years without anyone laughing.

I went to the head car not to fight. I went to play.

I had spent seventeen years listening to the rhythms of that train. Every section had its own rhythm—the tail was a slow, dragging beat like a heart that is tired but hasn't stopped yet; the middle sections were choppy and uncertain, like a drummer who has lost the groove; the first-class sections were polished and precise, like a pianist who has played the same piece ten thousand times and can play it in his sleep.

I carried these rhythms in my head like a musician carries a song. And I knew that somewhere in the head car, there was a rhythm that held them all together—a rhythm that was the heart of the train and the heart of everything that made that train a world.

Ma Gilliam gave me her blessing. She was sitting in the tail section, whittling a piece of wood the way she always whittled, her one good hand moving with the steady certainty of someone who has been doing the same thing for a very long time.

"You're not going to fight," she said. It wasn't a question.

"No."

"You're going to play."

"Yes."

She stopped whittling. Looked at me. "Curtis, you know what happens to people who play at the head of a Wilford train. He eats them. Not their bodies—something worse. He eats their rhythm. He takes what makes them interesting and he turns it into something boring."

"I know," I said.

"Then why are you going?"

"Because if I don't, nobody will. And this train has been boring for seventeen years."

She nodded slowly. "Your mother would be proud of you."

She was right about one thing. The head of the train was not what I expected.

I expected a fortress. I expected armed guards. I expected a man in a suit with a gun.

What I found was a man in a white shirt with a piano.

Elias Wilford sat at a grand piano the size of a small house, his hands on the keys, his eyes closed, his body moving with the music in a way that reminded me of my mother moving in the kitchen when she cooked. He played for a long time—a piece that was technically perfect and emotionally hollow, like a painting of a sunset that looks exactly like a sunset but doesn't feel like one.

When he finished, he opened his eyes and looked at me. He was older than I expected—sixty, maybe sixty-five, with white hair and a face that was handsome in the way that a painting is handsome: carefully constructed, carefully maintained, carefully empty.

"You're Curtis," he said.

"Yes."

"The drummer from the tail."

"I'm not a drummer."

"You are. You're the best drummer on this train. You just don't know it yet."

He stood up. Walked toward me. He moved with the confidence of a man who has never been told no.

"You tapped on the wall," he said.

"Yes."

"You tapped for Clara."

"Yes."

His expression changed. Not anger. Not jealousy. Something harder to read. Something like pain.

"Clara," he said. "She's a good pianist. She's a very good pianist. She's the best pianist on this train." He paused. "She's the best pianist I've ever heard. Except when she taps on the wall."

"Why?"

"Because when she taps on the wall, she's not playing for me. She's playing for someone else. And that makes the music different."

I looked at him. "You're not angry."

"I'm not angry," he said. "I'm sad. Because you're right, and I know you're right, and I've known it for seventeen years."

He walked back to the piano. Sat down. Played a single chord.

"This train," he said, "is not a prison. It's a performance. I built it to play music. Not to control people. Not to feed people. To play music. The sections, the tiers, the everything—that's not a social hierarchy. It's an orchestra. The tail is the percussion section. The middle is the strings. The head is the piano. And I am the conductor."

He looked at me. "But the orchestra has been playing the same piece for seventeen years. The same boring piece. The same hollow piece. I need new music. And you brought me new music."

He gestured to the piano. "Play."

I sat down on the bench beside him. I didn't know what to play. I had spent seventeen years tapping on walls. I had never sat at a piano.

But Clara had played for me. And I had tapped for her. And I knew what she was trying to say.

So I played the only thing I knew how to play—the rhythm of the tail section. The slow, dragging beat of people who have been hungry for seventeen years and haven't stopped tapping on the wall anyway.

Wilford listened. Then he added a note. Then another. Then a chord. And then he was playing with me—not over me, not around me, but with me, like two people having a conversation in a language that neither of them had ever learned but both of them understood.

Clara came to the head car when she heard us playing. She stood in the doorway and listened, and I saw her eyes fill with tears.

Yuna came too, and Luther, and Ma Gilliam, and people from every section who had followed the music like a sound that was pulling them forward.

And we played. Not a fight. Not a revolution. A jazz performance. The tail section tapping on the walls, the middle section clapping and stomping and singing, the head section playing instruments that had been stored away for seventeen years, and me and Wilford at the piano, weaving our rhythms together like two hands making a single gesture.

When we finished, the entire train was silent.

And then the door at the front of the head car opened.

Not because anyone opened it. Because the train opened it. The mechanism that had been locked for seventeen years clicked and turned and the door swung open, and light poured in—real light, the light of a New York morning in 1925, gold and warm and imperfect, falling on the floor of the head car like a benediction.

Wilford stood up. He walked to the door. He looked out.

"What do you see?" I asked.

He looked at me. His eyes were wet. "I see a city," he said. "I see a city that was there while we were on this train, and I see people who are living their lives, and I see—God help me—I see that they don't need us. They never needed us."

Clara came to stand beside him. She took his hand.

"Then let them live," she said.

Wilford looked at her. Looked at me. Looked at the train, at the people from every section standing in the corridors, listening, watching, waiting.

He nodded.

"Let them live," he said.

And we all stepped outside.

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