‘Okay,’ I said. ‘Now where’s the back exit which Nick used?’

She turned out the light and we went to the far end of the passage. A door opened on to a veranda, overlooking an alley. A steep flight of wooden steps linked the veranda with the alley.

‘Right. We’ll wait for him inside. If he shows fight, I’ll rap him on the dome, but if we can, we’ll try to persuade him to walk. He’s no light weight.’

We moved back into the passage again.

‘Any of these other rooms empty, do you know?’

‘Look and see,’ she said, opened the first door she came to and groped for the light switch. There was an angry yell, and a flood of violent language, and she turned off the light hurriedly.

‘That one isn’t,’ she said, moved to the next door.

‘Wait a minute,’ I said, grabbing her arm. ‘We’ll have a riot up here if you keep doing that. Let’s try the door opposite 15.

We went farther down the passage and paused outside the door opposite 15. I rapped gently. There was a sound of movement and the door opened.

A tall, tired-looking blonde in a none-too-lean wrap peered at me. Her painted face brightened a little, the smudged lips forced a smile.