Filipov amended quickly. "We have failed to achieve our main foreign policy objective: a permanent resolution of the Berlin situation. East Germany is our frontier post in Europe. Its borders secure the borders of Poland and Czechoslovakia. Its unresolved status is intolerable."

"All right," Dimka said, and he was surprised to hear a note of confidence in his own voice. "I think that's enough discussion of general principles. Before I close the meeting I will explain the trend of the first secretary's current thinking on the problem."

Filipov opened his mouth to protest against this abrupt termination, but Dimka cut him off. "Comrades will speak when invited by the chair," he said, deliberately making his voice a harsh grind; and they all went quiet.

"In Vienna, Khrushchev will tell Kennedy we can wait no longer. We have made reasonable proposals for regulating the situation in Berlin, and all we hear from the Americans is that they want no changes." Around the table, several men nodded. "If they will not agree to a plan, Khrushchev will say, then we will take unilateral action; and if the Americans try to stop us, we will meet force with force."

There was a long moment of silence. Dimka took advantage of it by standing up. "Thank you for your attendance," he said.

Natalya said what everyone was thinking. "Does that mean we are willing to go to war with the Americans over Berlin?"

"The first secretary does not believe there will be a war," said Dimka, giving them the evasive answer that Khrushchev had given him. "Kennedy is not mad."

He caught a look of mingled surprise and admiration from Natalya as he walked away from the table. He could not believe he had been so tough. He had never been a pussycat, but this was a powerful and smart group of men, and he had bullied them. His position helped: new though he was, his desk in the first secretary's suite of offices gave him power. And, paradoxically, Filipov's hostility had helped. They could all sympathize with the need to come down hard on someone who was trying to undermine the leader.

Vera was hovering in the anteroom. She was an experienced political assistant who would not panic unnecessarily. Dimka had a flash of intuition. "It's my sister, isn't it?" he said.

Vera was spooked. Her eyes widened. "How do you do that?" she said in awe.

It was not supernatural. He had feared for some time that Tanya was heading for trouble. He said: "What has she done?"

"She's been arrested."

"Oh, hell."

Vera pointed to a phone off the hook on a side table and Dimka picked it up. His mother, Anya, was on the line. "Tanya's in the Lubyanka!" she said, using the shorthand name for KGB headquarters in Lubyanka Square. She was close to hysteria.

Dimka was not taken totally by surprise. His twin sister and he agreed that there was a lot wrong with the Soviet Union, but whereas he believed reform was needed, she thought Communism should be abolished. It was an intellectual disagreement that made no difference to their affection for one another. Each was the other's best friend. It had always been that way.

You could be arrested for thinking as Tanya did--which was one of the things that was wrong. "Be calm, Mother, I can get her out of there," Dimka said. He hoped he would be able to justify that assurance. "Do you know what happened?"

"There was a riot at some poetry meeting!"

"I bet she went to Mayakovsky Square. If that's all . . ." He did not know everything his sister got up to, but he suspected her of worse than poetry.

"You have to do something, Dimka! Before they . . ."

"I know." Before they start to interrogate her, Mother meant. A chill of fear passed over him like a shadow. The prospect of interrogation in the notorious basement cells of KGB headquarters terrified every Soviet citizen.

His first instinct had been to say he would get on the phone, but now he decided that would not be enough. He had to show up in person. He hesitated momentarily: it could harm his career, if people knew he had gone to the Lubyanka to spring his sister. But that thought barely gave him pause. She came before himself and Khrushchev and the entire Soviet Union. "I'm on my way, Mother," he said. "Call Uncle Volodya and tell him what's happened."

"Oh, yes, good idea! My brother will know what to do."

Dimka hung up. "Phone the Lubyanka," he said to Vera. "Tell them very clearly that you're calling from the office of the first secretary, who is concerned about the arrest of leading journalist Tanya Dvorkin. Tell them that Comrade Khrushchev's aide is on his way to question them about it, and they should do nothing until he arrives."

She was making notes. "Shall I order up a car?"

Lubyanka Square was less than a mile from the Kremlin compound. "I have my motorcycle downstairs. That will be quicker." Dimka was privileged to own a Voskhod 175 bike with a five-speed gearbox and twin tailpipes.

He had known Tanya was heading for trouble because, paradoxically, she had ceased to tell him everything, he reflected as he rode. Normally they had no secrets from one another. Dimka had an intimacy with his twin that they shared with no one else. When Mother was away, and they were alone, Tanya would walk through the flat naked, to fetch clean underwear from the airing cupboard, and Dimka would pee without bothering to close the bathroom door. Occasionally Dimka's male friends would sniggeringly suggest that their closeness was erotic, but in fact it was the opposite. They could be so intimate only because there was no sexual spark.

But for the past year he had known she was hiding something from him. He did not know what it was, but he could guess. Not a boyfriend, he felt sure: they told each other everything about their romantic lives, comparing notes, sympathizing. Almost certainly it was political, he thought. The only reason she might keep something from him would be to protect him.

He drew up outside the dreaded building, a yellow brick palace erected before the revolution as the headquarters of an insurance company. The thought of his sister imprisoned in this place made him feel ill. For a moment he was afraid he wa

s going to puke.

He parked right in front of the main entrance, took a moment to recover his self-possession, and walked inside.