‘Good morning, Inspector.’

‘Morning, sir. Not disturbing you?’

Professor Costello waved his arm airily around the empty room. ‘Not a student in Edinburgh’s awake at this – to them – ungodly hour. Not the divinity students at any rate. No, Inspector, you’re not disturbing me.’

‘You got the books all right, sir?’

Costello pointed towards his glass-fronted bookshelves. ‘Safe and sound. The officer who delivered them said something about them being found abandoned . . .?’

‘Something like that, sir.’ Rebus glanced back at the door. ‘You haven’t had a proper lock fitted yet.’

‘Mea culpa, Inspector. Fear not, one’s on its way.’

‘Only I wouldn’t like you to lose your books again . . .’

‘Point taken, Inspector. Sit down, won’t you? Coffee?’ The hand this time was directed towards an evil-looking percolator sitting smoking on a hotplate in a corner of the room.

‘No thanks, sir. Bit early for me.’

Costello bowed his head slightly. He slid into the comfortable leather chair behind his comfortable oaken desk. Rebus sat on one of the modern, spindly metal-framed chairs the other side of it. ‘So, Inspector, social niceties dispensed with . . . what can I do for you?’

‘You gave some information to Chief Superintendent Watson, sir.’

Costello pursed his lips. ‘Confidential information, Inspector.’

‘At one time perhaps, but it may help us with a murder inquiry.’

‘Surely not!’

Rebus nodded. ‘So you see, sir, that changes things slightly. We need to know who your “friend” was, the one who told you about the . . . er . . .’

‘I believe the phrase is “hoor-hoose”. Almost poetic, much nicer at any rate than “brothel”.’ Costello almost squirmed in his chair. ‘My friend, Inspector, I did promise him . . .’

‘Murder, sir. I’d advise against withholding information.’

‘Oh yes, agreed, agreed. But one’s conscience . . .’

‘Was it Ronald Steele?’

Costello’s eyes opened wide. ‘Then you already know.’

‘Just an inspired guess, sir. You’re a frequent customer in his shop, aren’t you?’

‘Well, I do like to browse . . .’

‘And you were in his shop when he told you.’

‘That’s right. It was a lunchtime. Vanessa, his assistant, she was on her break. She’s a student here, actually. Lovely girl . . .’

If only you knew, thought Rebus.

‘Anyway, yes, Ronald told me his little guilty secret. He’d been taken to this hoor-hoose one night by some friends. He really was very embarrassed about it all.’

‘Was he?’

‘Oh, terribly. He knew I knew Superintendent Watson, and he wondered if I could pass word on about the establishment.’

‘So we could close it down?’

‘Yes.’

‘But he needed to know the night?’

‘He was desperate to know. His friends, you see, the ones who’d taken him. He wanted to warn them off.’

‘You know Mr Steele is a friend of Gregor Jack’s?’

‘Who?’

‘The MP.’

‘I’m sorry, the name doesn’t . . . Gregor Jack?’ Costello frowned, shook his head. ‘No.’

‘He’s been in all the newspapers.’