'If you wouldn't mind getting dressed, please…"

'If you could just come downstairs now…"

'You can put your trousers on first, sir, if you like…'

Then: 'Christ, sir, come and take a look at this.' Rebus followed the flushed, youthful face of the detective constable. 'Here we are, sir. Feast your peepers on this lot.'

Ah yes, the punishment room. Chains and thongs and whips. A couple of full-length mirrors, a wardrobe full of gear.

'There's more leather here than in a bloody milking shed.'

'You seem to know a lot about cows, son,' Rebus said. He was just thankful the room wasn't in use. But there were more surprises to come.

In parts, the house resembled nothing more lewd than a fancy-dress party – nurses and matrons, wimples and high heels. Except that most of the costumes revealed more than they hid. One young woman seemed to be wearing a rubber diving suit with the nipples and crotch cut away. Another looked like a cross between Heidi and Eva Braun. Watson watched the parade, righteous fury filling him. He had no doubts now: it was absolutely proper that this sort of place be closed down. Then he turned back to the conversation he was having with Mrs Croft, while Chief Inspector Lauderdale lingered only a short distance away. He had insisted on coming along, knowing his superior and fearing some almighty cock-up. Well, thought Rebus with a smile, no cock-ups in sight yet.

Mrs Croft spoke in a kind of gentrified Cockney, which became less gentrified as time went on and more couples spilled down the stairs and into the large, sofa-crammed living room. A room smelling of expensive perfume and proprietary whisky. Mrs Croft was denying everything. She was even denying that they were standing in a brothel at all.

I am not my brothel's keeper, thought Rebus. All the same, he had to admire her performance. She was a business-woman, she kept saying, a taxpayer, she had rights… and where was her solicitor?

'I thought it was her that was doing the soliciting,' Lauderdale muttered to Rebus: a rare moment of humour from one of the dourest buggers Rebus had ever worked with. And as such, it deserved a smile.

'What are you grinning at? I didn't know there was an interval. Get back to work.'

'Yes, sir.' Rebus waited till Lauderdale had turned away from him, the better to hear what Watson was saying, and then flicked a quick v-sign at him. Mrs Croft, though, caught the gesture and, perhaps thinking it intended at her, returned it. Lauderdale and Watson both turned towards where Rebus was standing, but by then he was already on his way…

Officers who had been posted in the back garden now marched a few pale-faced souls back into the house. One man had leapt from a first-floor window, and was hobbling as a result. But he was insistent, too, that no doctor was necessary, that no ambulance be called. The women seemed to find the whole thing amusing, and appeared especially taken by the looks on their clients' faces, looks ranging from the ashamed and embarrassed to the furious and embarrassed. There was some short-lived bravado of the I-know-my-rights variety. But in the main, everybody did as they were told: that is, they shut up and tried to be patient.

Some of the shame and embarrassment started to lift when one of the men recalled that it wasn't illegal to visit a brothel; it was only illegal to run one or work in one. And this was true, though it didn't mean the men present were going to escape into the anonymous night. Give them a scare first, then send them away. Starve the brothels of clients, and you'd have no brothels. That was the logic. So the officers were prepared with their usual stories, the ones they used with kerb-crawlers and the like.

'Just a quiet word, sir, between you and me, like. If I were you, I'd have myself checked over for AIDS. I'm serious. Most of these women could well be carrying the disease, even if it doesn't show. Mostly, it doesn't show till it's too late anyway. Are you married, sir? Any girlfriends? Best tell them to have a test, too. Otherwise, you never know, do you…?'

It was cruel stuff, but necessary; and as with most cruel words, there was a truth to it. Mrs Croft seemed to use a small back room as an office. A cash-box was found. So was a credit-card machine. A receipt-book was headed Crofter Guest House. As far as Rebus could tell, the cost of a single room was seventy-five pounds. Dear for a B amp;B, but how many company accountants would take the trouble to check? It wouldn't surprise Rebus if the place was VAT registered to boot…

'Sir?' It was Detective Sergeant Brian Holmes, newly promoted and bristling with efficiency. He was halfway up one of the flights of stairs, and calling down to Rebus. 'I think you better come up here…"

Rebus wasn't keen. Holmes looked to be a long way up, and Rebus, who lived on the second floor of a tenement, had a natural antipathy to stairs. Edinburgh, of course, was full of them, just as it was full of hills, biting winds, and people who liked to girn about things like hills and stairs and the wind…

'Coming.'

Outside a bedroom door, a detective constable stood in quiet discussion with Holmes. When Holmes saw Rebus reaching the landing, he dismissed the DC.

'Well, Sergeant?'

'Take a look, sir.'

'Anything you want to tell me first?'

Holmes shook his head. 'You've seen the male member before, sir, haven't you?'

Rebus opened the bedroom door. What was he expecting to find? A mock-up dungeon, with someone stretched out naked on the rack? A farmyard scene with a few chickens and sheep? The male member. Maybe Mrs Croft had a collection of them displayed on her bedroom wall. And here's one I caught in '73. Put up a tough fight, but I had it in the end…,

But no, it was worse than that. Much worse. It was an ordinary bedroom, albeit with red lightbulbs in its several lamps. And in an ordinary bed lay an ordinary enough looking woman, her elbow pressed into the pillow, head resting at an angle on her clenched fist. And on that bed, dressed and staring at the floor, sat someone Rebus recognized: the Member of Parliament for North and South Esk.

'Jesus Christ,' said Rebus. Holmes put his head round the door.

'I can't work in front of a fucking audience!' yelled the woman. Her accent, Rebus noted, was English. Holmes ignored her.

'This is a bit of a coincidence,' he said to Gregor Jack MP. 'Only, my girlfriend and me have just moved into your constituency.'

The MP raised his eyes more in sorrow than in anger.

'This is a mistake,' he said.' A terrible mistake.'

'Just doing a bit of canvassing, eh, sir?'

The woman had begun to laugh, head still resting on her hand. The red lamplight seemed to fill her gaping mouth. Gregor Jack looked for a moment as though he might be about to throw a punch in her general direction. Instead he tried a slap with his open hand, but succeeded only in catching her arm, so that her head fell back on to the pillow. She was still laughing, almost girl-like. She lifted her legs high into the air, the bedcovers falling away. Her hands thumped the mattress with glee. Jack had risen to his feet and was scratching nervously at one finger.

'Jesus Christ,' Rebus said again. Then: 'Come on, let's get you downstairs.'

Not the Farmer. The Farmer might go to pieces. Lauderdale then. Rebus approached with as much humility as he could muster.

'Sir, we've got a bit of a problem.'

'I know. It must have been that bugger Watson. Wanted his moment of glory captured. He's always been keen on publicity, you should know that.' Was that a sneer on Lauderdale's face? With his gaunt figure and bloodless face, he reminded Rebus of a painting he'd once seen of some Calvinists or Seceders… some grim bunch like that. Ready to burn anyone who came to hand. Rebus kept his distance, all the time shaking his head.