The rain in New York doesn't wash things clean. It just makes the grime slicker. That's what Mortimer Cole told himself as he watched Jack Callahan wake up on the concrete floor of the abandoned factory on the East River.

Jack's head was pounding. The last thing he remembered was the coffee—good coffee, the kind you drink at a place on Mulberry Street with marble counters and waiters who call you "sir." Then a hand over his mouth, a needle in his neck, and now this: cold floor, flickering fluorescent light, and a man in a trench coat standing over him like a shadow given form.

"Where am I?" Jack said. His voice was rough, the voice of a man who hadn't used it for anything important in years.

"Does it matter?" Mortimer's voice was flat, the voice of a man who had said too many things to too many people and run out of inflection. "You're in a room. You're tied to a chair. And you have fifty minutes before a drill bit the size of your thumb reaches the center of your forehead."

Jack looked. There it was—an industrial drill mounted on a horizontal track, aimed directly at his head. Beneath it, arranged at equal intervals, were ten sheets of thick cardboard. The machine was set to pierce one sheet every five minutes. The last sheet would be pierced at the fifty-minute mark. After that, the drill would keep moving.

"This is insane," Jack said. "You're insane."

"I'm a journalist," Mortimer said. "There's a difference."

He sat down on an upturned crate and pulled out a cigarette. He didn't offer one to Jack. Jack didn't ask.

"My daughter," Mortimer said, striking a match against the sole of his shoe. "Her name was Sarah. She was twenty-three. She worked at a gallery in SoHo. She had a laugh that could make you forget you were standing in a room with a stranger who was about to tell you something terrible."

Jack closed his eyes. He knew where this was going. He'd seen it in movies. He'd told himself he'd never be the guy in the movie—the guy who looks away.

"Three weeks ago," Mortimer continued, "Sarah was walking home from work. It was raining. She took a shortcut through an alley on Grand Street. A man attacked her. She fought. She got away. But she was scared, and she was alone, and she called the first person she saw—a cab driver who happened to be parked at the corner."

Jack's eyes opened.

"She called you, Jack. Or rather, she called a cab driver who looked like you, and you happened to be looking in her direction, and you happened to see what was happening, and you happened to drive away."

"That wasn't me," Jack said. But his voice didn't have any conviction behind it.

"Does it matter?" Mortimer said again. "She made the call. You were there. And you drove away. She lived for two more hours before the internal bleeding got her. Two hours. She was alone in a tenement on Canal Street, bleeding out on a mattress she'd found in the street, wondering why the person she called never came back."

Jack was sweating now. Not from fear, exactly. From the weight of it—the weight of a story he'd told himself for three weeks that said he wasn't responsible.

"I didn't know," he said.

"I know," Mortimer said. "That's the point. You didn't know. And that's why this isn't about revenge. Revenge would be simple. Revenge would be pulling a trigger. This—" He gestured at the drill. "This is about something else. This is about finding out whether the world contains a single person who will walk into a room and do the right thing without being asked, without being paid, without knowing the consequences."

He stood up. "There's a fire exit at the back of the factory. It's been open for the last twenty minutes. Anyone who passes by can come in. If they see you, they can call the police. Or they can cut your bonds. Or they can do nothing. I won't stop them. I'll just watch."

He walked to the door.

"Wait," Jack said. "What happens if no one comes?"

Mortimer paused. "Then you learn something about the world that you already suspected but didn't want to admit."

The door closed. Jack was alone with the drill and the ticking clock and the memory of a girl's laugh.

Ten minutes passed. Jack heard footsteps outside—two people, laughing, walking fast. They didn't stop.

Twenty minutes. A dog barked. Then silence.

Thirty minutes. Jack started talking to himself. He told himself stories—any stories—to fill the silence. He talked about the weather, about baseball, about the time he'd won fifty dollars at a card game in Jersey. He talked until his voice cracked.

Forty minutes. He stopped talking. He closed his eyes and tried to remember Sarah's laugh. He'd never met her, but he could hear it in his head, clear as a bell, and it was the most beautiful thing he'd ever heard.

Forty-five minutes. He heard a door open. Footsteps on concrete. He opened his eyes.

A woman stood in the doorway. She was young, maybe twenty-five, with dark hair and a leather jacket and a face that had already learned not to trust anything. She held a flashlight in one hand and a switchblade in the other.

"Who are you?" she said.

"Who are you?" Jack said.

She stepped into the room. She looked at the drill. She looked at Jack. She looked at the cardboard sheets—five of them already pierced, five still intact.

"Fifty minutes," she said.

"Forty-eight," Jack said. "There's two minutes left."

She didn't move. She stood there, weighing something—him, the drill, the moral mathematics of walking away versus walking in.

"Forty-eight and a half," Jack said.

She took a step forward. Then another. She reached into her pocket and pulled out a pair of wire cutters.

"Forty-eight and three quarters," Jack said.

She cut the bonds. Jack's arms fell to his sides, numb and tingling.

"Forty-nine," she said.

"Wait," Jack said. "Why are you doing this?"

She looked at him with eyes that had seen everything and trusted nothing. "Because someone should have done it for her."

The drill stopped.

Mortimer stood in the doorway. He hadn't seen the woman cut the bonds. He'd been standing there the whole time, watching through a crack in the door. He looked at Jack, who was rubbing his wrists. He looked at the woman, who was already backing away.

"Who are you?" Mortimer said.

"Does it matter?" she said.

And then she was gone, disappearing into the rain the same way she'd appeared—without warning, without explanation, without leaving a trace.

Mortimer looked at Jack. "You're free to go."

Jack didn't move. "What about you?"

Mortimer smiled—a thin, broken smile that didn't reach his eyes. "I have somewhere else to be."

He walked out into the rain. The factory was silent except for the drip of water from a broken pipe and the distant sound of a siren wailing somewhere in the city that never slept and never cared.