Stock wasn’t always that way, and before March 1933 he had been a bit of a Red. He knew that I knew it, and it always worried him that there were others who would remember it too. So I didn’t blame him for the picture and the sign. Everyone in Germany was somebody different before March 1933. And as I’m always saying, ‘Who isn’t a National Socialist when there’s a gun pointed at his head?’

I sat down at an empty table and surveyed the rest of the clientele. A couple of tables away were two bulls from the Queer Squad, the Department for the Suppression of Homosexuality: a bunch of what are little better than blackmailers. At a table next to them, and sitting on his own, was a young Kriminalassistent from the station at Wedersche Market, whose badly pock-marked face I remembered chiefly for his having once arrested my informer, Neumann, on suspicion of theft.

Frau Stock took my order of pig’s knuckle with sauerkraut briskly and without much in the way of pleasantry. A shrewish woman, she knew and disapproved of my paying Stock for small snippets of interesting gossip about what was going on at the Alex. With so many officers coming in and out of the place, he often heard quite a lot. She moved off to the dumb-waiter and shouted my order down the shaft to the kitchen. Stock squeezed out from behind his bar and ambled over. He had a copy of the Party newspaper, the Beobachter, in his fat hand.

‘Hallo, Bernie,’ he said. ‘Lousy weather we’re having, eh?’

‘Wet as a poodle, Max,’ I said. ‘I’ll have a beer when you’re ready.’

‘Coming right up. You want to look at the paper?’

‘Anything in it?’

‘Mr and Mrs Charles Lindbergh are in Berlin. He’s the fellow that flew across the Atlantic.’

‘It sounds fascinating, really it does. I suppose the great aviator will be opening a few bomber factories while he’s here. Maybe even take a test-flight in a shiny new fighter. Perhaps they want him to pilot one all the way to Spain.’

Stock looked nervously over his shoulder and gestured for me to lower my voice. ‘Not so loud, Bernie,’ he said, twitching like a rabbit. ‘You’ll get me shot.’ Muttering unhappily, he went off to get my beer.