When my partner’s old DKW pulled up at the wooden gate, I got into the passenger seat and pointed across to the other side of the car park, nearest to the tenements, where there were still quite a few spaces left, the ones nearer the theatre itself having been taken by those going to the eight o’clock show.

‘That’s our man’s place there,’ I said. ‘On the second floor. Number nine.’

‘Did you get a name?’

‘It’s our friend from the clinic, Klaus Hering.’

‘That’s nice and tidy. What does he look like?’

‘He’s about my height, thin, wiry build, fair hair, rimless glasses, aged about thirty. When he went in he was wearing a blue suit. If he leaves see if you can’t get in there and find the pansy’s love letters. Otherwise just stay put. I’m going to see the client for further instructions. If she’s got any I’ll be back tonight. If not, then I’ll relieve you at six o’clock tomorrow morning. Any questions?’ Bruno shook his head. ‘Want me to ring the wife?’

‘No thanks. Katia’s used to my odd hours by now, Bernie. Anyway, me not being there will help to clear the air. I had another argument with my boy Heinrich when I got back from the Zoo.’

‘What was it this time?’

‘He’s only gone and joined the motorized Hitler Youth, that’s all.’

I shrugged. ‘He would have to have joined the regular Hitler Youth sooner or later.’

‘The little swine didn’t have to be in such a damned hurry to join, that’s all. He could have waited to be taken in, like the rest of the lads in his class.’

‘Come on, look on the bright side. They’ll teach him how to drive and look after an engine. They’ll still turn him into a Nazi, of course, but at least he’ll be a Nazi with a skill.’

Sitting in a taxi back to Alexanderplatz where I had left my car, I reflected that the prospect of his son acquiring mechanical skills probably wasn’t much of a consolation to a man who, at the same age as Heinrich, had been a junior cycling champion. And he was right about one thing: Heinrich really was a perfect little swine.

I didn’t call Frau Lange to let her know I was coming, and although it was only eight o’clock by the time I got to Herbertstrasse, the house looked dark and uninviting, as if those living there were out, or had retired to bed. But that’s one of the more positive aspects of this job. If you’ve cracked the case then you are always assured of a warm welcome, no matter how unprepared they are for your arrival.