It was puzzling and frightening.

She pushed through the crowd. Now she could see the problem. A crude barbed-wire fence had been erected across the near end of the bridge. A small gap in the fence was manned by police who seemed to be refusing to let anyone through.

Rebecca was tempted to ask what was going on, but she did not want to draw attention to herself. She was not far from Friedrich Strasse Station: from there she could go by subway directly to Marienfelde.

She turned south, walking faster now, and took a zigzag course around a series of university buildings to the station.

There was something wrong here, too.

Several dozen people were crowded around the entrance. Rebecca fought her way to the front and read a notice pasted to the wall that said only what was obvious: the station was closed. At the top of the steps, a line of police with guns formed a barrier. No one was being admitted to the platforms.

Rebecca began to be fearful. Perhaps it was a coincidence that the first two crossing places she had chosen were blocked. And perhaps not.

There were eighty-one places where people could cross from East to West Berlin. The next nearest was the Brandenburg Gate, where the broad Unter den Linden passed through the monumental arch into the Tiergarten. She walked south on Friedrich Strasse.

As soon as she turned west on Unter den Linden she knew she was in trouble. Here again there were tanks and soldiers. Hundreds of people were gathered in front of the famous gateway. When she got to the front of the crowd, Rebecca saw another barbed-wire fence. It was strung across wooden sawhorses and guarded by East German police.

Young men who looked like Walli--leather jackets, narrow trousers, Elvis hairstyles--were shouting insults from a safe distance. On the West Berlin side, similar types were yelling angrily, and occasionally throwing stones at the police.

Looking more closely, Rebecca saw that the various policemen--Vopos, border police, and factory militia--were making holes in the road, planting tall concrete posts, and stringing barbed wire from post to post in a more permanent arrangement.

Permanent, she thought, and her spirits sank into an abyss.

She spoke to a man next to her. "Is it everywhere?" she said. "This fence?"

"Everywhere," he said. "The bastards."

The East German regime had done what everyone said could not be done: they had built a wall across the middle of Berlin.

And Rebecca was on the wrong side.

PART TWO

BUG

1961-1962

CHAPTER ELEVEN

George felt wary when he went to lunch with Larry Mawhinney at the Electric Diner. George was not sure why Larry had suggested this, but he agreed out of curiosity. He and Larry were the same age and had similar jobs: Larry was an aide in the office of air force chief of staff General Curtis LeMay. But their bosses were at loggerheads: the Kennedy brothers mistrusted the military.

Larry wore the uniform of an air force lieutenant. He was all soldier: clean shaven, with buzz-cut fair hair, his tie knotted tightly, his shoes shiny. "The Pentagon hates segregation," he said.

George raised his eyebrows. "Really? I thought the army was traditionally reluctant to trust Negroes with guns."

Mawhinney lifted a placatory hand. "I know what you mean. But, one, that attitude was always overtaken by necessity: Negroes have fought in every conflict since the War of Independence. And two, it's history. The Pentagon today needs men of color in the military. And we don't want the expense and inefficiency of segregation: two sets of bathrooms, two sets of barracks, prejudice and hatred between men who are supposed to be fighting side by side."

"Okay, I buy that," said George.

Larry cut into his grilled-cheese sandwich and George took a forkful of chili con carne. Larry said: "So, Khrushchev got what he wanted in Berlin."

George sensed that this was the real subject of the lunch. "Thank God we don't have to go to war with the Soviets," he said.

"Kennedy chickened out," Larry said. "The East German regime was close to collapse. There might have been a counterrevolution, if the president had taken a tougher line. But the Wall has stopped the flood of refugees to the West, and now the Soviets can do anything they like in East Berlin. Our West German allies are mad as hell about it."

George bristled. "The president avoided World War Three!"

"At the cost of letting the Soviets tighten their grip. It's not exactly a triumph."