‘Well, of course, there are those who know all about the rotten pay and conditions on the autobahns. I suppose a lot of them think that it’s better not to sign on for relief at all rather than risk being sent to work on the roads.’ We were coming into Potsdam on the Neue Königstrasse. Potsdam. A shrine where the older residents of the town light the candles to the glorious, bygone days of the Fatherland, and to their youth; the silent, discarded shell of Imperial Prussia. More French-looking than German, it’s a museum of a place, where the old ways of speech and sentiment are reverently preserved, where conservatism is absolute and where the windows are as well polished as the glass on the pictures of the Kaiser.

A couple of kilometres down the road to Lehnin, the picturesque gave way abruptly to the chaotic. Where once had been some of the most beautiful countryside outside Berlin, there was now the earth-moving machinery and the torn brown valley that was the half built Lehnin — Brandenburg stretch of autobahn. Closer to Brandenburg, at a collection of wooden huts and idle excavating equipment, I pulled up and asked a worker to direct me to the foreman’s hut. He pointed at a man standing only a few metres away.

‘If you want him, that’s the foreman there.’ I thanked him, and parked the car. We got out.

The foreman was a stocky, red-faced man of medium height, and with a belly that was bigger than a woman who has reached the full term of her pregnancy: it hung over the edge of his trousers like a climber’s rucksack. He turned to face us as we approached, and almost as if he had been preparing to square up to me, he hitched up his trousers, wiped his stubbly jaw with the back of his shovel-sized hand and transferred most of his weight on to his back foot.

‘Hallo there,’ I called, before we were quite next to him. ‘Are you the foreman?’ He said nothing. ‘My name is Gunther, Bernhard Gunther. I’m a private investigator, and this is my assistant, Fraulein Inge Lorenz.’ I handed him my identification. The foreman nodded at Inge and then returned his gaze back to my licence. There was a literalness about his conduct that seemed almost simian.

‘Peter Welser,’ he said. ‘What can I do for you people?’

‘I’d like to speak to Herr Bock. I’m hoping he can help us. We’re looking for a missing person.’

Welser chuckled and hitched up his trousers again. ‘Christ, that’s a funny one.’ He shook his head and then spat onto the earth. ‘This week alone I’ve had three workers disappear. Perhaps I should hire you to try and find them, eh?’ He laughed again.

‘Was Bock one of them?’