‘Everything was new. The garter-belt, the handbag, the shoes. There wasn’t one item in that case that looked as though it had been used before. Now what does that tell you?’

Inge shrugged. She was still slightly piqued at having been left behind. ‘Maybe he’s got a new job, going door-to-door, selling women’s clothes.’

I raised my eyebrows.

‘All right then,’ she said. ‘Maybe this woman that he’s taking to London doesn’t have any nice clothes.’

‘More like, doesn’t have any clothes at all,’ I said. ‘Rather a strange kind of woman, wouldn’t you say?’

‘Bernie, just you come home with me. I’ll show you a woman without any clothes.’

For a brief second I entertained myself with the idea. But I went on, ‘No, I’m convinced that Haupthändler’s mystery girlfriend is starting out on this trip with a completely new wardrobe, from top to toe. Like a woman with no past.’

‘Or,’ said Inge, ‘a woman who is starting afresh.’ The theory was taking shape in her mind even as she was speaking. With greater conviction, she added, ‘A woman who has had to sever contact with her previous existence. A woman who couldn’t go home and pick up her things, because there wasn’t time. No, that can’t be right. She has until Monday night after all. So perhaps she’s afraid to go home, in case there’s someone waiting for her there.’ I nodded approvingly, and was about to develop this line of reasoning, but found that she was there ahead of me. ‘Perhaps,’ she said, ‘this woman was Pfarr’s mistress, the one the police are looking for. Vera, or Eva, I forget which.’

‘Haupthändler in this with her? Yes,’ I said thoughtfully, ‘that could fit. Maybe Pfarr gives his mistress the brush-off when he finds out that his wife is pregnant. The prospect of fatherhood has been known to bring some men to their senses. But it also happens to spoil things for Haupthandler, who might himself have had ambitions as far as Frau Pfarr was concerned. Maybe Haupthandler and this woman Eva got together and decided to play the part of the wronged lover - in tandem, so to speak — and also make a little money into the bargain. It’s not unlikely that Pfarr might have told Eva about his wife’s jewellery.’ I stood up, finishing my drink.

‘Then maybe Haupthandler is hiding Eva somewhere.’

‘That makes three maybes. More than I’m used to having over lunch. Any more and I’ll get sick.’ I glanced at my watch. ‘Come on, we can think about it some more on the way.’

‘On the way where?’

‘Kreuzberg.’

She levelled a well-manicured finger at me. ‘And this time, I’m not being left somewhere safe while you get all the fun. Understood?’

I grinned at her, and shrugged. ‘Understood.’