You can tell a lot by a client’s shoes. That’s the only thing I’ve picked up from Sherlock Holmes. Six’s were ready for the Winter Relief- that’s the National Socialist People’s Welfare Organization where you send all your old clothes. But then German shoes aren’t much good anyway. The ersatz leather is like cardboard; just like the meat, and the coffee, and the butter, and the cloth. But coming back to Herr Six, I didn’t have him marked as so stricken by grief that he was sleeping in his clothes. No; I decided he was one of these eccentric millionaires that you sometimes read about in the newspapers: they spend nothing on anything, which is how they come to be rich in the first place.

‘She was shot dead, in cold blood,’ he said bitterly. I could see we were in for a long night. I got out my cigarettes.

‘Mind if I smoke?’ I asked. He seemed to recover himself at that.

‘Do excuse me, Herr Gunther,’ he sighed. ‘I’m forgetting my manners. Would you like a drink or something?’ The ‘or something’ sounded just fine, like a nice four-poster, perhaps, but I asked for a mocha instead. ‘Fritz?’

Schemm stirred on the big sofa. ‘Thank you, just a glass of water,’ he said humbly. Six pulled the bell-rope, and then selected a fat black cigar from the box on the desk. He ushered me to a seat, and I dumped myself on the other sofa, opposite Schemm. Six took a taper and pushed it at a flame. Then he lit his cigar and sat down beside the man in grey. Behind him the library door opened and a young man of about thirty-five came into the room. A pair of rimless glasses worn studiously at the end of a broad, almost negroid nose belied his athletic frame. He snatched them off, stared awkwardly at me and then at his employer.

‘Do you want me in this meeting, Herr Six?’ he said. His accent was vaguely Frankfurt.

‘No, it’s all right, Hjalmar,’ said Six. ‘You get off to bed, there’s a good fellow. Perhaps you’d ask Farraj to bring us a mocha and a glass of water, and my usual.’