'How did you get them then? Been in a fight? Hit her a few times before you chucked her in?'

Nothing. He looked scared, but he was resilient. Their chances of keeping him in were, to put it mildly, not good. He didn't need a solicitor; he knew he just had to keep his mouth shut.

'Been in trouble before, eh? You know the score, don't you? That's why you're keeping quiet. Much good will it do you, pal. Much good.'

Indeed. The pathologist, Dr Curt, was now being harried. They needed to know: accident, suicide, or murder? They desperately needed to know. But before any news arrived, the man began to talk.

I was drunk,' he told them, 'didn't know what I was saying. I don't know what made me say it.' This was the story he stuck to, repeating it and refining it. They pressed for his name and address. 'I was drunk,' he said. 'That's all there is to it. I'm sober now, and I'd like to go. I'm sorry I said what I did. Can I go now?'

Nobody at the pub had been keen to press charges, not once the offending body was removed from the premises. Unpaid bouncers, thought Rebus, that's all we are. Was the man going to walk? Were they going to lose him? Not without a fight.

'We need a name and address before we can let you go.'

'I was drunk. Can I go now, please?'

'Your name!'

'Please, can I go?'

Curt still wasn't ready to pronounce. An hour or two. Some results he was waiting for…

'Just give us a name, eh? Stop pissing about.'

'My name's William Glass. I live at 48 Semple Street in Granton.'

There was silence, then sighs. 'Check that, will you?' one officer asked the other. Then: 'Now that wasn't so painful, was it, Mr Glass?'

The other officer grinned, then had to explain why. 'Painful… Glass… pane of glass, see?'

'Just do that check, eh?' said his colleague, rubbing at a headache which, these days, never seemed to leave him.

'They've let him go,' Holmes informed Rebus.

'About time. A wild haggis chase and no mistake.'

Holmes came into the office and made himself comfortable on the spare chair.

'Don't stand on ceremony,' said Rebus from his desk, 'just because I'm the senior officer. Why not take a seat, Sergeant?'

'Thank you, sir,' said Holmes from the chair. 'I don't mind if I do. He gave his address as Semple Street, Granton.'

'Off Granton Road?'

That's the one.' Holmes looked around. 'It's like an oven in here. Can't you open a window?'

'Jammed shut, and the heating's -'

'I know, either on full blast or nothing. This place…' Holmes shook his head.

'Nothing a bit of maintenance wouldn't fix.'

Funny,' said Holmes, 'I've never seen you as the sentimental sort…'

'Sentimental?'

'About this place. Give me St Leonard 's or Fettes any day.'

Rebus wrinkled his nose. 'No character,' he said.

'Speaking of which, what news of the male member?'

'That joke's worn as thin as my hair, Brian. Why not part-ex it against a new one?' Rebus breathed out noisily through his nose and threw down the pen he'd been playing with. 'What you mean,' he said, 'is what news of Mrs Jack, and the answer is none, nada, zero. I've put out the description of her car, and all the posh hotels are being checked. But so far, nothing.'

'From which we infer…?'

'Same answer: nothing. She could still be off at some Iona spiritual retreat, or shacked up with a Gaelic crofter, or doing the Munros. She could be pissed-off at her hubby, or not know a thing about any of it.'

'And all that kit I found, the sex-shop stock clearance?'

'What about it?'

'Well…" Holmes seemed stuck for an answer. 'Nothing really.'

'And there you've put your finger on it, Sergeant. Nothing really. Meantime, I've got work enough to be getting on with.' Rebus laid a solemn hand on the pile of reports and case-notes in front of him. 'How about you?'

Holmes was out of his chair now. 'Oh, I've plenty keeping me busy, sir. Please, don't worry yourself about me.'

'It's natural for me to worry, Brian. You're like a son to me.'

'And you're like a father to me,' Holmes replied, heading for the door. 'The farther I get from you, the easier my life seems to be.'

Rebus screwed a piece of paper into a ball, but the door closed before he had time to take aim. Ach, some days the job could be a laugh. Well, okay, a grin at least. If he forgot all about Gregor Jack, the load would be lighter still. Where would Jack be now? At the House of Commons? Sitting on some committee? Being fêted by businesses and lobbyists? It all seemed a long way from Rebus's office, and from his life.

William Glass… no, the name meant nothing to him. Bill Glass, Billy Glass, Willie Glass, Will Glass… nothing. Living at 48 Semple Street. Hold on… Semple Street in Granton. He went to his filing cabinet and pulled out the file. Yes, just last month. Stabbing incident in Granton. A serious wounding, but not fatal. The victim had lived at 48 Semple Street. Rebus remembered it now. Bedsits carved from a house, all of them rented. A rented bedsit. If William Glass was living at 48 Semple Street, then he was staying in a rented bedsit. Rebus reached for his telephone and called Lauderdale, to whom he told his story.

'Well, someone there vouched for him when the patrol car dropped him off. The officers were told to be sure he did live there, and apparently he does. Name's William Glass, like he said.'

'Yes, but those bedsits are short-let. Tenants get their social security cheque, hand half the cash over to the landlord, maybe more than half for all I know. What I'm saying is, it's not much of an address. He could disappear from there any time he liked.'

'Why so suspicious all of a sudden, John? I thought you were of the opinion we were wasting our time in the first place?'

Oh, but Lauderdale always knew the question to ask, the question to which, as a rule, Rebus did not have an answer.

'True, sir,' he said. 'Just thought I'd let you know.'

'I appreciate it, John. It's nice to be kept informed.' There was a slight pause there, an invitation for Rebus to join Lauderdale's 'camp'. And after the pause: 'Any progress on Professor Costello's books?'

Rebus sighed. 'No. sir.'

'Oh well. Mustn't keep you chatting then. Bye, John.'

'Goodbye, sir.' Rebus wiped his palm across his forehead. It was hot in here, like a dress rehearsal for the Calvinist hell.

The fan had been installed and turned on, and an hour or so later Doctor Curt provided the shit to toss at it.

'Murder, yes," he said. 'Almost definitely murder. I've discussed my findings with my colleagues, and we're of a mind.' And he went on to explain about froth and unclenched hands and diatoms. About problems of differentiating immersion from drowning. The deceased, a woman in her late twenties or early thirties, had imbibed a good deal of drink prior to death. But she had been dead before she'd hit the water, and the cause of death was probably a blow to the back of the head, carried out by a right-handed attacker (the blow itself having come from the right of the head).

But who was she? They had a photograph of the dead woman's face, but it wasn't exactly breakfast-time viewing. And though her description and a description of her clothes had been given out, nobody had been able to identify her. No identification on the body, no handbag or purse, nothing in her pockets…

'Better search the area again, see if we can come up with a bag or a purse. She must have had something.'

'And search the river, sir?'

'A bit late for that probably, but yes, better give it a shot.'

'The alcohol,' Dr Curt was telling anyone who would listen, had 'muddied the water, you see', after which he smiled his slow smile. 'And the fish had eaten their fill: fish fingers, fish feet, fish stomach…'

'Yes, sir. I see, sir.'