The message began as one thing and arrived as six different things, and each time it changed hands, it changed meaning, and by the time it reached its destination, no one who held it knew what it meant, which was exactly the point.

It was November, 1962, and the world was holding its breath. The Cuban Missile Crisis had been resolved three weeks earlier, but the relief was temporary. Berlin was still divided, and the dividing line ran through the center of the city like a scar that would never close, and everyone in West Berlin knew that the scar could open at any moment.

Hans Vogel was an intelligence agent, though that was not his official title. His official title was cultural liaison officer at the British Information Service, which meant he distributed books and organized film screenings and gave tours of Westminster to visiting German delegations. His unofficial title, the one he used in his own mind, was translator. He translated things that were not words: signals, glances, pauses, silences. He translated them for the British, who did not understand Germans, and for the Germans, who did not understand the British, and for himself, which was the most difficult translation of all.

He was forty-seven years old, born in Berlin to a German mother and a British father, and he had spent his life in the space between two countries that did not trust each other and therefore did not trust him. He worked for the British because that was where the salary was, but he thought for himself, which was dangerous in an intelligence operation and essential in a human being.

The message came to him on a Tuesday in November, delivered by a woman named Elke, who worked for the East German cultural ministry and who met with Hans once a week at a cafe near Checkpoint Charlie, where they discussed books and films and occasionally, in code that was not very good code, exchanged information that neither of them fully understood.

"I have something for you," Elke said, sitting across from him at a small table with a cup of coffee that she did not drink. "It goes to someone in Washington. Through three people."

Hans looked at her. Elke was thirty-two, sharp-featured, with eyes that missed nothing and a habit of speaking in sentences that were just long enough to hide their meaning. "Three people?"

"Three people. I give it to Friedrich. Friedrich gives it to Ingrid. Ingrid gives it to someone in the American zone. I do not know who. Friedrich does not know who. We are not responsible for the final handoff."

She slid a folded piece of paper across the table. It was thin, the kind of paper used in official East German documents, and it was covered in handwriting that was small and precise. Hans did not unfold it. He did not need to. The weight of it was enough.

"What is it?" he asked.

"A message," Elke said. "That is all I know. And all Friedrich knows. And I suspect, all that anyone knows except the person who wrote it."

He folded the paper and put it in his pocket. He did not read it. Not yet. Not here. Not in a cafe near Checkpoint Charlie, where the walls had ears and the ears had radios and the radios had connections to buildings in Washington and Moscow and London and every capital that mattered.

The first handoff was Friedrich, a historian at the Free University who specialized in British colonial literature and who met with Hans every other Thursday at a bookstore on Kurfuerstendamm. Friedrich was sixty, thin, and wore tweed jackets in weather that was too warm for tweed, and he spoke English with the kind of precise Oxford accent that suggested he had learned it from books, which he had.

Hans gave him the message on a Thursday in mid-November, in the back of the bookstore, behind a shelf of Kipling and Conrad and Orwell, handing over the folded paper the way a banker hands over a safe deposit box key: casually, efficiently, without making eye contact.

"Three handoffs," Hans said. "You are number one. Give it to Ingrid by Friday."

Friedrich nodded. He did not ask questions. He was old enough to know that questions in November 1962 were dangerous and young enough to know that not asking questions was how you survived.

The second handoff was Ingrid, Friedrich's granddaughter, who was twenty-four and studied physics at the Free University and who met Friedrich on Friday morning at a bakery near the university, where she bought a croissant and he bought nothing because he was not hungry and they walked through the campus while he told her about the war and she listened because she was polite and because listening to old men talk about the war was what grandchildren were for.

Friedrich gave her the message on Friday morning, in the bakery, while she was paying for her croissant and he was pretending to examine a display of chocolate cakes. He slid the folded paper into her hand as if he were adjusting her coat collar, a gesture that looked like affection and was actually logistics.

"Three handoffs," he said. "Number two. Ingrid, I do not know number three. The message will tell you."

She looked at him. "Grandfather, what is it?"

"I do not know," he said. "And knowing would make me responsible. I am not responsible. I am a historian. I deal with the past. This is the present. The present is not my field."

She took the paper. She did not eat her croissant. She walked across the campus and sat in the library and unfolded the message and read it for the first time.

The message was in German. It was short. It said:

THE WATER IS RISING BUT THE BRIDGES ARE NOT BURNING. THE PEOPLE WHO BUILT THE BRIDGES ARE SLEEPING. THE PEOPLE WHO WANT TO BURN THEM ARE WAITING. DO NOT WAKE THE BUILDERS. DO NOT FRIGHTEN THE WAITERS. THE WATER WILL DECIDE.

Ingrid read it three times. She was a physics student. She understood equations and experiments and the precise language of scientific description. She did not understand poetry. This was not poetry. It was a metaphor, and metaphors were dangerous because they meant different things to different people, and in November 1962, in divided Berlin, meaning was the most dangerous thing in the world.

She decided that the water was the nuclear tension, the rising threat that everyone could feel but no one could stop. The bridges were the diplomatic channels, the backroom negotiations, the secret communications between governments. The builders were the diplomats, the people who had spent years constructing the fragile infrastructure of mutual understanding. The waiters were the hardliners, on both sides, who wanted to burn the bridges and start fresh, because the bridges were failing and the water was rising and the only rational response was to abandon the old structure and build a new one from scratch.

She interpreted the message as a plea: do not disrupt the ongoing diplomatic process. The water will resolve itself. Trust the process.

She was confident in her interpretation. She was also wrong.

The third handoff was someone she did not know. She was supposed to give the message to a contact at the American cultural office, a man named Mr. Davies, who would forward it to Washington. But on the Wednesday after she read it, she changed her mind. She was afraid. Not of Friedrich or her grandfather or the message itself, but of what the message might become once it reached Washington, once it passed through American hands, once it was interpreted by people who did not understand Berlin and did not understand Germany and did not understand the difference between a metaphor and a directive.

She gave the message to a friend, a journalism student named Klaus, who had contacts at the American newspaper bureau, and Klaus gave it to a reporter named Arthur, who gave it to his editor, who sent it to Washington as a human interest piece about "mysterious messages circulating in Berlin."

By the time it reached Washington, the message had been edited, summarized, and interpreted by four people who had never been to Berlin and did not want to be. The diplomats had become the builders. The hardliners had become the burners. The water had become war.

And the message that Elke had carried from East Berlin to West Berlin, that Hans had carried from a cafe to a bookstore, that Friedrich had carried from a bookstore to a bakery, that Ingrid had carried from a bakery to a library, had arrived at its destination as something entirely different from what it had been when it left.

Six handoffs. Six meanings. The original message, written by someone in East Berlin who understood the tension of November 1962 and tried to describe it in a metaphor that would not trigger panic, had been transformed into a warning that might trigger exactly what it sought to prevent.

Ingrid sat in her apartment that night, looking out at the Berlin sky, which was the color of wet concrete, and she thought about the message and about how meaning changes when it moves through hands, how each hand adds its own interpretation, its own fear, its own understanding, and how the thing that arrives at the destination is never the thing that left the origin, but only a reflection of it, distorted by the number of hands it has passed through and the distance it has traveled.

She thought about her grandfather, who had given her the message without reading it, and about Hans, who had carried it from Elke without reading it, and about Elke, who had carried it from someone she would never name, and she wondered who had written it, and what they had meant, and whether the meaning had been lost or only changed, and whether the difference between loss and change was itself just another handoff, another translation, another version of the same message passing through another pair of hands and becoming something new.

The water was rising. The bridges were not burning. The builders were sleeping. The waiters were waiting. And the message, transformed six times, six different things, six different meanings, had arrived at its destination as a question instead of an answer, which was perhaps what it should have been all along.

Ingrid kept the original message folded in her desk drawer for the rest of the year, and every time she passed the Free University and saw the Brandenburg Gate in the distance, she thought about the distance between intention and reception, about how a metaphor written in a cramped apartment in East Berlin had traveled through three pairs of hands and a newspaper bureau and a diplomatic inbox and emerged on the other side as something unrecognizable, and she wondered whether the original author, whoever they were, had known what was happening to their words, whether they had understood that the act of transmitting a message through a divided city was itself a form of distortion, that each handoff was a translation, and each translation was a betrayal, and each betrayal was necessary, because without the distortion there would have been no message at all, only a feeling too large to carry and too dangerous to name.