‘Come off it, Neumaier. We both know that there’s a lot more to your operation than the heart-warming little scene you’re putting on out front there.’

He blew some smoke and looked at the end of his cigar. ‘Are you suggesting that I buy stolen merchandise, Herr Gunther, because if you are -’

‘Keep your ears stiff, Neumaier, I haven’t finished yet. My client’s flea is solid. Cash money.’ I tossed the photograph of Six’s diamonds at him. ‘If some mouse walks in here trying to sell it, you give me a call. The number’s on the back.’

Neumaier regarded it and me distastefully and then stood up. ‘You are a joke, Herr Gunther. With a few cups short in your cupboard. Now get out of here before I call the police.’

‘You know, that’s not a bad idea,’ I said. ‘I’m sure they’ll be very impressed with your public spirit when you offer to open up your safe and invite them to inspect the contents. That’s the confidence of honesty, I suppose.’

‘Get out of here.’

I stood up and walked out of his office. I hadn’t intended to handle it that way, but I hadn’t liked what I’d seen of Neumaier’s operation. In the shop Coathanger was half-way through offering an old woman a price for her jewel-box that was less than she might have got for it at the Salvation Army hostel. Several of the Jews waiting behind her looked at me with an expression that was a mixture of hope and hopelessness. It made me feel about as comfortable as a trout on a marble slab, and for no reason that I could think of, I felt something like shame.

Gert Jeschonnek was a different proposition. His premises were on the eighth floor of Columbus Haus, a nine-storeyed building on Potsdamer Platz which has a strong emphasis on the horizontal line. It looked like something a long-term prisoner might have made, given an endless supply of matches, and at the same time it put me in mind of the nearly eponymous building near Tempelhof Airport that is Columbia Haus - the Gestapo prison in Berlin. This country shows its admiration for the discoverer of America in the strangest ways.

The eighth floor was home to a whole country-club of doctors, lawyers and publishers, who were only just getting by on 30,000 a year.

The double entrance doors to Jeschonnek’s office were made of polished mahogany, on which appeared in gold lettering, ‘GERT JESCHONNEK. PRECIOUS STONE MERCHANT’. Beyond these was an L-shaped office with walls that were a pleasant shade of pink, on which were hung several framed photographs of diamonds, rubies and various gaudy little baubles that might have stimulated the greed of a Solomon or two. I took a chair and waited for an anaemic young man sitting behind a typewriter to finish on the telephone. After a minute he said: