The office on forty-second floor looked out over Manhattan the way a fishbowl looks out over an aquarium: everything was visible but nothing was real. David Chen sat at his desk in the server room of Nexus Technologies and watched the city move below him in its frantic, purposeful way, and he thought about the code he was writing, which was designed to find vulnerabilities in government systems, which was legal because Nexus Technologies had a contract with the Department of Defense, which made him feel dirty in a way that had nothing to do with physical cleanliness and everything to do with the slow accumulation of compromises that made up a life.

His name was David Chen. He was thirty years old, he was Chinese-American, he lived in an apartment in Queens that was too small and too expensive, and he had spent the last eight years of his life writing code that helped the government spy on people. Not terrorists, not criminals, just people. Ordinary people who had no idea that their emails were being read and their phone calls being recorded and their movements being tracked by systems that they had helped build, indirectly, by choosing to work for a company that sold its services to the highest bidder.

Sarah O'Connor sat at the desk next to his. She was twenty-eight years old, Irish-American, with red hair that she cut herself in the bathroom sink because she didn't trust hair salons, and a mind that was sharper than any weapon David had ever encountered. She had worked for the NSA before she came to Nexus, and she had left because she had discovered things that she didn't like, and she hadn't told anyone what those things were because some discoveries are burdens, not privileges.

"Hey," she said, leaning over the partition between their desks. "You coming to the party tonight?"

"What party?"

"Jake's birthday. He's renting a rooftop in Midtown. There will be drinks and music and people who will pretend to be more interesting than they are. It's very New York."

David looked at his screen, at the lines of code that would allow the government to access private communications, and he said: "Maybe."

Sarah studied his face for a moment, the way a navigator studies a storm front, and then she said: "Something's bothering you. Want to talk about it?"

"No."

"That's also an answer."

She went back to her desk, and David went back to his code, and the city went on below them, indifferent to the small dramas playing out on the forty-second floor.

That evening, David did not go to the party. Instead, he went home to his apartment in Queens, which was small and expensive and contained a bed, a desk, a bookshelf full of programming manuals, and a window that looked out over a brick wall. He sat at his desk and opened his laptop and began to research, not for work, but for himself, because there were questions that had been bothering him for months and he had been too afraid to ask them out loud.

The questions were about electromagnetic weapons. Not the kind of weapons that exploded things, but the kind that exploded information. Weapons that could disrupt communications, that could blind sensors, that could throw a modern city back into the dark without firing a single shot.

He found things. Things that were not supposed to be public. Things that suggested the government was developing a weapon that could disable the communications of an entire city, maybe an entire state, maybe an entire country. A weapon that didn't kill anyone but that could kill everything that held modern society together.

He showed the research to Sarah the next morning, and she went pale, and she said: "I knew it. I knew they were building something, and I didn't know what, but I knew."

"What do we do?" David asked.

"We do nothing," Sarah said. "We go to work. We write our code. We go home. We pretend we don't know. Because if we don't pretend, they will find out, and they will silence us, and then who will know?"

But David couldn't pretend. He couldn't go to work and write code and pretend he didn't know that the code he was writing was helping the government build a weapon that could destroy the fabric of modern life without destroying a single building or killing a single person.

His brother Patrick called that evening. Patrick was thirty-five years old, five years older than David, and he worked for the Pentagon as a military consultant, which meant he sat in offices and wrote reports and attended meetings and told generals what to do, which was a long way of saying he had become everything David thought he was fighting against.

"Hey, little brother," Patrick said. "How's the manhattan life treating you?"

"Fine," David said. "You?"

"Busy. There's something I need to tell you. Something I shouldn't be telling you, but I'm telling you anyway because you're my brother and I trust you."

David felt his stomach tighten. "What is it?"

"The government is building an electromagnetic weapon. A real one. Not the kind that blows things up. The kind that blinds everything. Satellites, radar, communications, GPS, everything. They're calling it the 'Broadband Jamming Initiative,' but that's not what it does. What it does is it creates a storm. An electromagnetic storm that covers a wide area and disables everything that depends on radio waves."

"How dangerous is it?"

"That depends on who you ask. The military says it's a defensive weapon, necessary for protecting against terrorist attacks. The people who've seen it in action say it's a weapon of mass destruction that doesn't leave bodies but that might be worse, because it destroys everything except the people who built it."

David sat in his apartment in Queens and looked out at the brick wall and thought about the city below him, eight million people living their lives, completely unaware that someone, somewhere, was building a weapon that could take away everything they depended on without them ever seeing it coming.

"What are you going to do?" Patrick asked.

"I don't know," David said. And it was the truest thing he had said in years.

He talked to Sarah the next day, and they talked for hours, and what they talked about was the ethics of technology, the responsibility of engineers, the question of whether people who build systems have an obligation to understand what those systems will be used for and to resist when they realize the truth.

"We built this," Sarah said. "Not just us. All of us. Every engineer who wrote code for the government without asking questions. Every scientist who accepted funding without asking what it would be used for. Every person who looked the other way because it was easier than looking."

"So what do we do?" David asked.

"We expose it," Sarah said. "We take everything we know and we give it to the press, and we let the public decide."

"And if they decide the weapon should exist?"

"Then at least they'll decide with their eyes open."

David spent the next week gathering evidence. He downloaded documents, copied files, recorded conversations, and built a package of information that was so damaging that if it were made public, it would cause a political crisis. He gave the package to Sarah, and she gave it to a reporter at the New York Times, a woman named Lisa who had spent fifteen years investigating government overreach and who had been waiting for exactly this kind of evidence for ten of them.

Lisa published the story on a Sunday, which is when newspapers put their most important stories on the front page because Sunday readers have time to think about the things that will disturb their sleep. The story was everywhere: front page of every newspaper, lead story on every news program, trending topic on every social media platform.

The government denied everything, of course. They called the story a lie, a fabrication, a conspiracy by people who didn't understand the complexities of national security. But the evidence was too strong, too detailed, too undeniable. Congress launched an investigation. The program was suspended pending review. And David went back to his apartment in Queens and looked out at the brick wall and felt nothing at all, which was perhaps the most disturbing thing of all.