‘I remember it.’ And I had good reason to. It had been one of my first cases after leaving the Adlon and setting up as a private investigator. I said: ‘I was lucky.’

‘Never underestimate luck,’ said Schemm pompously. Sure, I thought: just look at the Führer.

By now we were on the edge of the Grunewald Forest in Dahlem, home to some of the richest and most influential people in the country, like the Ribbentrops. We pulled up at a huge wrought-iron gate which hung between massive walls, and Freshface had to hop out to wrestle it open. Ulrich drove on through.

‘Drive on,’ ordered Schemm. ‘Don’t wait. We’re late enough as it is.’ We drove along an avenue of trees for about five minutes before arriving at a wide gravel courtyard around which were set on three sides a long centre building and the two wings that comprised the house. Ulrich stopped beside a small fountain and jumped out to open the doors. We got out.

Circling the courtyard was an ambulatory, with a roof supported by thick beams and wooden columns, and this was patrolled by a man with a pair of evil-looking Dobermanns. There wasn’t much light apart from the coachlamp by the front door, but as far as I could see the house was white with pebbledash walls and a deep mansard roof- as big as a decent-sized hotel of the sort that I couldn’t afford. Somewhere in the trees behind the house a peacock was screaming for help.

Closer to the door I got my first good look at the doctor. I suppose he was quite a handsome man. Since he was at least fifty, I suppose you would say that he was distinguished-looking. Taller than he had seemed when sitting in the back of the car, and dressed fastidiously, but with a total disregard for fashion. He wore a stiff collar you could have sliced a loaf with, a pin-striped suit of a light-grey shade, a creamy-coloured waistcoat and spats; his only hand was gloved in grey kid, and on his neatly cropped square grey head he wore a large grey hat with a brim that surrounded the high, well-pleated crown like a castle moat. He looked like an old suit of armour.