On the board she wrote: "Come on, baby, let's do the Twist." Then she said: "What's that in German?"

For a while she forgot about her troubles.

She found the letter in her pigeonhole at the midafternoon break. She carried it with her into the staff room and made a cup of instant coffee before opening it. When she read it she dropped her coffee.

The single sheet of paper was headed: "Ministry for State Security." This was the official name for the secret police: the unofficial name was the Stasi. The letter came from a Sergeant Scholz, and it ordered her to present herself at his headquarters office for questioning.

Rebecca mopped up her spilled drink, apologized to her colleagues, pretended nothing was wrong, and went to the ladies' room, where she locked herself in a cubicle. She needed to think before confiding in anyone.

Everyone in East Germany knew about these letters, and everyone dreaded receiving one. It meant she had done something wrong--perhaps something trivial, but it had come to the attention of the watchers. She knew, from what other people said, that there was no point protesting innocence. The police attitude would be that she must be guilty of something, or why would they be questioning her? To suggest they might have made a mistake was to insult their competence, which was another crime.

Looking again, she saw that her appointment was for five this afternoon.

What had she done? Her family was deeply suspect, of course. Her father, Werner, was a capitalist, with a factory that the East German government could not touch because it was in West Berlin. Her mother, Carla, was a well-known Social Democrat. Her grandmother, Maud, was the sister of an English earl.

However, the authorities had not bothered the family for a couple of years, and Rebecca had imagined that her marriage to an official in the Justice Ministry might have gained them a ticket of respectability. Obviously not.

Had she committed any crimes? She owned a copy of George Orwell's anti-Communist allegory Animal Farm, which was illegal. Her kid brother, Walli, who was fifteen, played the guitar and sang American protest songs such as "This Land Is Your Land." Rebecca sometimes went to West Berlin to see exhibitions of abstract painting. Communists were as conservative about art as Victorian matrons.

Washing her hands, she glanced in the mirror. She did not look scared. She had a straight nose and a strong chin and intense brown eyes. Her unruly dark hair was sharply pulled back. She was tall and statuesque, and some people found her intimidating. She could face a classroom full of boisterous eighteen-year-olds and silence them with a word.

But she was scared. What frightened her was the knowledge that the Stasi could do anything. There were no real restraints on them: complaining about them was a crime in itself. And that reminded her of the Red Army at the end of the war. The Soviet soldiers had been free to rob, rape, and murder Germans, and they had used their freedom in an orgy of unspeakable barbarism.

Rebecca's last class of the day was on the construction of the passive voice in Russian grammar, and it was a shambles, easily the worst lesson she had given since she qualified as a teacher. The pupils could not fail to know that something was wrong and, touchingly, they gave her an easy ride, even making helpful suggestions when she found herself lost for the right word. With their indulgence she got through it.

When school ended, Bernd was closeted in the head's office with officials from the Education Ministry, presumably discussing how to keep the school open with half the staff gone. Rebecca did not want to go to Stasi headquarters without telling anyone, just in case they decided to keep her there, so she wrote him a note telling him of the summons.

Then she caught a bus through the wet streets to Normannen Strasse in the suburb of Lichtenberg.

The Stasi headquarters there was an ugly new office block. It was not finished, and there were bulldozers in the car park and scaffolding at one end. It showed a grim face in the rain, and would not look much more cheerful in sunshine.

When she went through the door she wondered if she would ever come out.

She crossed the vast atrium, presented her letter at a reception desk, and was escorted upstairs in an elevator. Her fear rose with the lift. She emerged into a corridor painted a nightmarish shade of mustard yellow. She was shown into a small bare room with a plastic-topped table and two uncomfortable chairs made of metal tubing. There was a pungent smell of paint. Her escort left.

She sat alone for five minutes, shaking. She wished she smoked: it might steady her. She struggled not to cry.

Sergeant Scholz came in. He was a little younger than Rebecca--about twenty-five, she guessed. He carried a thin file. He sat down, cleared his throat, opened the file, and frowned. Rebecca thought he was trying to seem important, and she wondered whether this was

his first interrogation.

"You are a teacher at Friedrich Engels Polytechnic Secondary School," he said.

"Yes."

"Where do you live?"

She answered him, but she was puzzled. Did the secret police not know her address? That might explain why the letter had come to her at school rather than at home.

She had to give the names and ages of her parents and grandparents. "You're lying to me!" Scholz said triumphantly. "You say your mother is thirty-nine and you are twenty-nine. How could she have given birth to you when she was ten years old?"

"I'm adopted," Rebecca said, relieved to be able to give an innocent explanation. "My real parents were killed at the end of the war, when our house suffered a direct hit." She had been thirteen. Red Army shells were falling and the city was in ruins and she was alone, bewildered, terrified. A plump adolescent, she had been singled out for rape by a group of soldiers. She had been saved by Carla, who had offered herself instead. Nevertheless that terrifying experience had left Rebecca hesitant and nervous about sex. If Hans was dissatisfied, she felt sure it must be her fault.

She shuddered and tried to put the memory away. "Carla Franck saved me from . . ." Just in time, Rebecca stopped herself. The Communists denied that Red Army soldiers had committed rape, even though every woman who had been in East Germany in 1945 knew the horrible truth. "Carla saved me," she said, skipping the contentious details. "Later, she and Werner legally adopted me."

Scholz was writing everything down. There could not be much in that file, Rebecca thought. But there must be something. If he knew little about her family, what was it that had attracted his interest?

"You are an English teacher," he said.