I parked the car, went up the steps to the front door and pulled the bell. Almost immediately a light came on in the window above the door, and after a minute or so the door opened to reveal the black cauldron’s ill-tempered face.

‘Do you know what time it is?’

‘It’s just gone eight,’ I said. ‘The curtains are going up at theatres all over Berlin, diners in restaurants are still scrutinizing the menu and mothers are just thinking that it’s about time their children were in bed. Is Frau Lange at home?’

‘She’s not dressed for no gentlemen callers.’

‘Well that’s all right. I haven’t brought her any flowers or chocolates. And I’m certainly not a gentleman.’

‘You spoke the truth there all right.’

‘That one was for free. Just to put you in a good enough mood to do as you’re told. This is business, urgent business, and she’ll want to see me or know the reason why I wasn’t let in. So why don’t you run along and tell her I’m here.’

I waited in the same room on the sofa with the dolphin armrests. I didn’t like it any better the second time, not least because it was now covered with the ginger hairs of an enormous cat, which lay asleep on a cushion underneath a long oak sideboard. I was still picking the hairs off my trousers when Frau Lange came into the room. She was wearing a green silk dressing-gown of the sort that left the tops of her big breasts on show like the twin humps of some pink sea-monster, matching slippers, and she carried an unlit cigarette in her fingers. The dog stood dumbly at her corn-plastered heel, its nose wrinkling at the overpowering smell of English lavender that trailed off Frau Lange’s body like an old feather-boa. Her voice was even more masculine than I had remembered.

‘Just tell me that Reinhard had nothing to do with it,’ she said imperiously.

‘Nothing at all,’ I said.

The sea-monster sank a little as she breathed a sigh of relief. ‘Thank God for that,’ she said. ‘And do you know who it is that has been blackmailing me, Herr Gunther?’

‘Yes. A man who used to work at Kindermann’s clinic. A male nurse called Klaus Hering. I don’t suppose that the name will mean much to you, but Kindermann had to dismiss him a couple of months ago. My guess is that while he was working there he stole the letters that your son wrote to Kindermann.’

She sat down and lit her cigarette. ‘But if his grudge was against Kindermann, why pick on me?’