Frau Schmidt’s apartment was typical of the older generation of people in this city. The furniture was solid and elaborate - Berliners spend a lot of money on their tables and chairs - and there was a big porcelain-tiled stove in the living room. A copy of an engraving by Dürer, which was as common in the Berliner’s home as an aquarium in a doctor’s waiting room, hung dully above a dark red Biedermeier sideboard on which were placed various photographs (including one of our beloved Führer) and a little silk swastika mounted in a large bronze frame. There was also a drinks tray, from which I took a bottle of schnapps and poured a small glassful.

‘You’ll feel better after you’ve drunk this,’ I said, handing her the glass, and wondering whether or not I dared take the liberty of pouring myself one too. Enviously, I watched her knock it back in one. Smacking her fat lips she sat down on a brocaded chair by the window.

‘Feel up to answering a few questions?’

She nodded. ‘What do you want to know?’

‘Well for a start, how long had you known Herr and Frau Pfarr?’

‘Hmm, let’s see now.’ A silent movie of uncertainty flickered on the woman’s face. The voice emptied slowly out of the Boris Karloff mouth, with its slightly protruding teeth, like grit from a bucket. ‘It must be a year, I suppose.’ She stood up again and removed her coat, revealing a dingy, floral-patterned smock. Then she coughed for several seconds, tapping herself on the chest as she did so.

All this time I stood squarely in the middle of the room, my hat on the back of my head and my hands in my pockets. I asked her what sort of couple the Pfarrs had been.

‘I mean, were they happy? Argumentative?’ She nodded to both of these suggestions.

‘When I first went to work there, they were very much in love,’ she said. ‘But it wasn’t long after that that she lost her job as a schoolteacher. Quite cut up about it, she was. And before long they were arguing. Not that he was there very often when I was. But when he was, then more often than not they’d have words, and I don’t mean squabbles, like most couples. No, they had loud, angry arguments, almost as if they hated each other, and a couple of times I found her crying in her room afterwards. Well, I really don’t know what it was they had to be unhappy about. They had a lovely home - it was a pleasure to clean it, so it was. Mind you, they weren’t flashy. I never once saw her spending lots of money on things. She had lots of nice clothes, but nothing showy.’

‘Any jewellery?’