`Pretty good, eh?’ said Smylie.

'Aye, pretty good.’

Rebus hadn't flown in a few years.

He'd had a fear of flying ever since his SAS training.

Already he was dreading the return trip. It wasn't when he was high up, he didn't mind that. But the take-off and landing, that view of the ground, so near and yet far enough to kill you stone dead if you hit it. Here it came again, the plane dropping fast now, too fast. His fingers were sore against the armrests. There was every chance of them locking there. He could see a surgeon amputating at the wrists…

And then they were down. Smylie was quick to stand up. The seat had been too narrow for him, with not enough legroom. He worked his neck and shoulders, then rubbed his knees.

'Welcome to Belfast,' he said 'We like to give visitors the tour,' Yates said.

He was Inspector Yates of the Royal Ulster Constabulary, and both he and his car were in mufti. He had a face formed of fist-fights or bad childhood infections, scar tissue and things not quite in their right place. His nose veered leftwards, one earlobe hung lower than the other, and his chin had been stitched together not altogether successfully. You'd look at him in a bar and then look away again quickly, not risking the stare he deserved. He had no neck, that was another thing. His head sat on his shoulders like a boulder on the top of a hill.

'That's very kind,' said Smylie, as they sped into town, 'but we'd-‘.

'-Lets you see what we're dealing with.’ Yates kept looking in his rearview, conducting a conversation with the mirror. 'The two cities. It's the same in any war zone. I knew this guy, height of the trouble in Beirut, he was recruited as a croupier there. Bombs falling, gunmen on the rampage, and the casinos were still open. Now these,' he nodded out of the windscreen, 'are the recruiting stations: They had left the City Airport behind, shaved the commercial centre, and were passing through a wasteland. Until now, you couldn't have said which British city you were in. A new road was being built down by the docks. Old flats, no worse than those in the Gar-B, were being demolished. As Yates had commented, sometimes the divide was hidden.

Not far away, a helicopter hovered high in the sky, watching someone or something. Around them, whole streets had been bulldozed. The kerbstones were painted green and white.

'You'll see red, white and blue ones in other areas.’

On the gable-end of a row of houses was an elaborate painting. Rebus could make out three masked figures, their automatic weapons raised high. There was a tricolour above them, and a phoenix rising from flames above this.

'A nice piece of propaganda,' said Rebus.

Yates turned to Smylie. 'Your man knows what he's talking about. It's a work of art. These are some of the poorest streets in Europe, by the way.’

They didn't look so bad to Rebus. The gable-end had reminded him again of the Gar-B. Only there was more rebuilding going on here. New housing developments were rising from the old.

'See that wall?’ said Yates. 'That's called an environmental wall built and maintained by the Housing Executive.’

It was a red brick wall, functional, with a pattern in the bricks. 'There used to be houses there. The other side of the wall is Protestant, once you get past the wasteland. They knock down the houses and extend the wall. There's the Peace Line too, that's an ugly old thing, made from iron rather than bricks. Streets like these, they're meat and drink to the paramilitaries. The loyalist areas are the same.’

Eyes were following their slow progress, the eyes of teenagers and children grouped at street corners. The eyes held neither fear nor hate, only mistrust. On a wall someone had daubed painted messages, old references to the H Block and Bobby Sands, newer additions in praise of the IRA, and promising revenge against the loyalist paramilitaries, the UVF and UFF predominantly. Rebus saw himself patrolling these streets, or streets like them, back when there had been more houses, more people on the move. He'd often been the 'back walker', which meant he stayed at the back of the patrol and faced the rear, his gun pointing towards the people they'd just passed, men staring at the ground, kids making rude gestures, shows of bravado, and mothers pushing prams. The patrol moved as cautiously as in any jungle.

'See, here we are,' Yates was saying, 'we're coming into Protestant territory now.’

More gable-ends, now painted with ten-foot-high Williams of Orange riding twenty-foot-high white horses. And then the cheaper displays, the graffiti, exhorting the locals to 'Fuck the Pope and the IRA'. The letters FTP were everywhere. Five minutes before, they had been FKB: Fuck King Billy. They were just routine, a reflex. But of course they were more. You couldn't laugh them off as name-calling, because the people who'd written them wouldn't let you. They kept shooting each other, and blowing each other up.

Smylie read one of the slogans aloud. ' "Irish Out”.’

He turned to Yates. 'What? All of them?’

Yates smiled. 'The Catholics write "Troops Out", so the loyalists write "Irish Out". They don't see themselves as Irish, they're British.’

He looked in the mirror again. 'And they're getting more vicious, loyalist paramilitaries killed more civvies last year than the IRA did. That's a first, so far as I know. The loyalists hate us now, too.’

'Who's us?’

'The RUC. They weren't happy when the UDA was outlawed. Your man, Sir Patrick Mayhew, he lit the fuse.’

'I read about some riots.’

'Only last month, here in the Shankill and elsewhere. They say we're harassing them. We can't really win, can we?’

'I think we get the picture,' said Smylie, anxious to get to work. But Rebus knew the point the RUC man was making: this was their work.

'If you think you get the picture,' Yates said, 'then you're not getting the picture. You're to blame, you know.’

'Eh?’

'The Scots. You settled here in the seventeenth century, started pushing around the Catholics.’

'I don't think we need a history lesson,' Rebus said quietly. Smylie was looking like he might explode.

'But it's all about history,' Yates said levelly. 'On the surface at least.’

'And underneath?’

'Paramilitaries are in the business of making money. They can't exist without money. So now they've become gangsters, pure and simple, because that's the easy way to make the money they need. And then it becomes self perpetuating. The IRA and UDA get together now and then and discuss things. They sit around a table together, just like the politicians want them to, but instead of talking about peace, they talk about carving up the country. You can extort from these taxi firms if we can extort from the building sites. You even get cases where the stuff the one side has stolen is passed on to the other for them to sell in their areas. You get times when the tension's high, then it's back to business as usual. It's like one of those mafia films, the money these bastards are making…’

Yates shook his head. 'They can't afford peace. It'd be bad for business.’

'And bad for your business too.’

Yates laughed. 'Aye, right enough, overtime wouldn't be easy to come by. But then we might live to retirement age, too. That doesn't always happen just now.’

Yates had lifted his radio transmitter. 'Two-Six-Zero, I'm about five minutes from base. Two passengers.’

The radio spat static.

'Received and understood.’

He put down the receiver. 'Now this,' he said, 'this is Belfast too. South Belfast, you don't hear much about it because hardly anything ever happens here. See what I mean about two cities?’

Rebus had been noticing the change in their surroundings. Suddenly it looked prosperous, safe. There were wide treelined avenues, detached houses, some of them very new-looking. They'd passed the university, a red-brick replica of some older college. Yet they were still only ten minutes from 'the Troubles'. Rebus knew this face of the city, too. He'd only spent the one tour of duty here, but he remembered the big houses, the busy city centre, the Victorian pubs whose interiors were regarded as national treasures. He knew the city was surrounded by lush green countryside, winding lanes and farm tracks, at the end of which might sit silent milk-churns packed with explosives.