The knock on their door came soon after dark, and as he went to answer it Russell realised that his unconscious had registered the arrival of a car a minute or so earlier. The visitors would be official.
The first face he saw - both boyish and bookish - belonged to a tall young man in an SS Obersturmfuhrer's uniform. The second, half hidden behind the first man's shoulder, belonged to Uwe Kuzorra. 'Herr John Russell,' the Obersturmfuhrer stated rather than asked.
The man had lost an arm, Russell realised. 'That's me,' he said, without unblocking the doorway.
'We need to ask you some questions. Inside, if you please.'
Russell stepped back to allow them in, and pushed the door shut. Effi had retreated to the bedroom doorway, and the Obersturmfuhrer was staring at her with obvious recognition.
'I'll leave you to it,' she said with a smile, and closed the door behind her.
Russell offered the two men seats, his mind racing. They must have discovered that he had an appointment to meet Sullivan on the previous day. What could he safely tell them? Certainly not that Sullivan had secret information to hand over - Russell had no desire to face an espionage charge.
Kuzorra lowered himself onto the sofa with obvious pleasure. The detective would have had a long and busy day, and he was well into his sixties by now.
The Obersturmfuhrer remained on his feet, tapping his right thigh with his hand.
'You know who I am,' Kuzorra told Russell. 'This is my assistant, Obersturmfuhrer Schwering.'
The younger man reluctantly accepted Russell's offer of a handshake. 'I noticed you this morning,' Kuzorra went on. 'I was rather surprised to find that you were still in Berlin.'
'I live here,' Russell said with a shrug. Saying as little as he could seemed a good guiding principle where this conversation was concerned.
'We have discovered that our victim arranged a meeting with you,' the Obersturmfuhrer said accusingly. 'Stettin Station at twelve o'clock, I believe.'
'Who told you that?' Russell asked pleasantly.
'That is neither...' Schwering began.
'His wife,' Kuzorra cut his subordinate off. 'His widow,' he corrected himself.
'It's true that I had arranged to meet him,' Russell admitted. 'But I was late. If he ever turned up, he was gone by the time I got there.'
The Obersturmfuhrer looked unconvinced, but let that go for the moment. 'So what was this meeting for?'
'He said he had some information for me. As I'm sure you know, most journalists get their information from a variety of sources.'
'Was he giving or selling?' Kuzorra wanted to know.
'Selling. Patrick Sullivan was only ever interested in the truth as a commodity.'
'What was this information?' Schwering asked.
Russell shrugged. 'I've no idea. Sullivan obviously thought it was worth something, but he wouldn't tell me anything in advance. He was probably afraid that spreading a few clues would allow me to dig the story up myself.'
The Obersturmfuhrer was far from happy. 'We shall be checking your story,' he said, as if knowing that fact would persuade Russell to come clean.
'I'm sure Herr Russell is aware of that,' Kuzorra said, getting to feet. 'How is your wife?' Russell asked, hoping to move matters onto a more convivial footing.
'She died last year,' Kuzorra told him, a moment of bleakness apparent in his eyes. 'A sudden illness. She didn't suffer.'
Unlike you, Russell thought. He remembered how well suited the two of them had seemed. 'I'm sorry,' he said. 'How long have you been back at work?'
'Since that time.' He managed a thin smile. 'I needed something to do.'
Russell showed them out, and leant back against the door with some relief.
'Trouble?' Effi asked as she emerged.
'I don't think so.' He filled in those bits of the conversation which she had been unable to follow from the other side of the bedroom door.
'That's sad,' she said of Kuzorra's loss. She had not met the detective before, but remembered Russell's description of him and his wife Katrin.
'She seemed the one with the energy,' Russell recalled. 'And she made a wonderful cup of coffee.'
'Let's go out to eat,' Effi said. 'In case they come back. I don't want to share my last free evening before filming with an overgrown boy in a black uniform.'
They followed the white kerbs to the Ku'damm, and walked slowly west along the wide boulevard. This was also blacked-out, but the sheer number of phosphorescent badges and masked headlights provided sufficient illumination for seeing their way and recognising restaurants. Most of the latter were doing good business, Berliners having just received their December ration tickets.
They opted for the Chinese. The meat in the chow mein didn't taste much like chicken, but then it didn't taste much like anything else either. Russell wasn't even sure it was meat. Watching the members of the extended family who owned and ran the restaurant hurrying to and fro, he wondered, not for the first time, what on heaven's earth had persuaded them to set up shop in Hitler's Reich.
After they had finished eating someone stopped at the table to ask for Effi's autograph, and she obliged with her usual good grace. 'Are you looking forward to tomorrow?' Russell asked once the happy fan had returned to her own table.
'First days are usually fun,' she said. 'Everyone's trying to make a good impression on everyone else, even the director. And a masterpiece still seems possible, especially if you've only read your own part of the script. Of course, the first scene usually shatters that particular illusion.'
'Not the first scene of GPU, surely?'
'That may have the whole cast in stitches. I hope so. If everyone knows what rubbish it is, then we really can have some fun with it. But if the director thinks he's making an important statement, then God help us.' She smiled a quite dazzling smile at Russell. 'But I do love it most of the time. If it wasn't for the getting up at four-thirty in the morning, and the fact that we hardly see each other when I'm filming...'
'I know. Particularly now, when I may be whisked out of the country at a moment's notice.'
She reached a hand across the table. 'I've been meaning to tell you. Just in case you don't know. I shall be waiting for you, however long it takes. Though I can't guarantee that I'll still have my film star looks. '
'I love you too,' he said. 'And with any luck at all we'll soon be enjoying regular conjugal visits in Switzerland, courtesy of the Abwehr.'
'Conjugal, eh?'
'I was hoping.'
'I shall miss our bed, though.'
'It is an excellent bed.'
'And waiting for us right now.'
'I'll get the bill.'
Russell was still half asleep when he heard the knock on the door, and his first thought was that Effi had returned, having forgotten her keys and God knew what else. He was almost at the door when he noticed the clock, and realised that she would be in front of the cameras by this time.
It was Kuzorra, and this time he was alone. Russell stood aside to let the detective in, and offered him a cup of coffee.
'Real coffee?' his guest asked.
'I'm afraid not. Even we pampered foreigners have trouble getting that.'
'Then I'll pass.'
Kuzorra took the seat he had occupied the evening before. 'There's a phrase you journalists use when you want a quote, and the person concerned doesn't want anyone to know that it came from them...'
'Off the record.'
'That's the one. Well, I'd like you to tell me what you know about this business - off the record.'