'Things have changed,' Subh said. 'Look at them, Ibrahim. Look at them with those hateful crosses stitched to their shoulders.'

'They won't even know how the city works. The city is its people, its history… This is unthinkable.'

'And yet such things are being thought,' said the doctor. 'You are a sane man, Ibrahim, in a world of the mad. And we men of sanity must cope with the consequences of the decisions of the others. Come, my friend. Stand with me now. In the coming days, the city will ask one last service of you.'

'Yes. One last service.'

'And,' Subh said, glaring at the Christians, 'the family has one great goal to achieve before we abandon this place, as we were forced out of Cordoba.'

Ibrahim knew she meant the Codex, supposedly lost under the floor of the mosque. She was scheming over trifles in this moment of catastrophe for a whole civilisation. He thought she was as insane as the Christians. And yet he must cope with her as well as the city's calamity.

He struggled to rise, leaning on Ibn Shaprut.

Fernando set a deadline of one month for the evacuation. He told the emir bluntly that he wished to celebrate Christmas Day in Seville's great mosque, reconsecrated as a Christian cathedral.

And in that last month, Ibrahim worked harder even than in the worst days of the siege, as he helped to organise the abandonment of a great city.

When he walked through the streets he found a mood of anger and disbelief about the evacuation. He was shown around houses and gardens, still grand even after the siege, where patios shone and rusted fountains had once bubbled water; he was shown shops and offices and businesses, carefully built up over generations. How could all this be given up for ignorant Christian barbarians to despoil? Some people wouldn't move for sheer stubbornness. And others hoped, no matter how sternly Ibrahim spoke of the Christians' ruthless determination. Perhaps you could find some way to accommodate under the Christians. Or perhaps you could simply hide in your home behind a locked door, and somehow everything would turn out all right. Ibrahim knew this was fantasy. He encouraged people to take away the deeds of their houses, to lock the doors, to carry off the keys. This was enough to allow at least some of these desperate new paupers to walk out proudly, bundles on their heads, the deeds tucked carefully inside their djellabas expressing their intention to return. But others were determined to stay, defying the Christians come what may. Often Ibrahim could only walk away.

If there were some who wouldn't leave, there were many more who couldn't, for they were too ill or too young or too old, or damaged by the long siege. So Ibrahim organised parties of refugees who might be able to carry a few of the vulnerable with them. He tried, too, to gather people into parties large enough to resist the predations of the bandits in the country.

And while all this went on, Ibrahim still had a city to run. Even in this last month people still had to eat and drink, sewage had to be taken away, fires controlled, outbreaks of disease contained. Ibn Shaprut told him that it was like tending a dying man, all mundane detail and a steady decline, and an awful knowledge that an utter termination was near.

In the end, as Fernando's deadline neared, the people of the city simply began walking out of the gates to the south and east. These were urban folk, not used even to walking far, and many of them overloaded themselves at the start of their flight. Some even tried to carry out precious bits of furniture, even carpets. You would see these bundles dumped after a few hundred paces, as the harsh landscape quickly took its toll.

Ten thousand people drained out of the city, to vanish into the plains of the south. At the peak of the flight it was an astonishing sight; they turned the roads to the south black.

When they were gone, in the city by night you could see only a scattered flickering of lights across a landscape of gleaming domes and minarets, and the only sounds were the smash of glass, drunken laughter, the occasional scream, and the muezzin's faithful calls. Ibrahim had the oppressive sense of being present at the end of a great phase of history.

Then it was the last week, and then the last day.

And on the morning of the twenty-first of December, the last morning of Moorish Seville, Ibrahim, with Ibn Shaprut at his side, walked the deserted streets one last time. Abandoned bundles littered the cobbles. They saw a scrawny dog nose through one package, looking for food.

'Amazing,' Ibn Shaprut said. 'I thought the dogs had all been eaten.'

'Evidently they're better at hiding than we are. Let's hope they are good at playing the Christian.' Ibrahim reached out to the dog, but it thought he wanted its food and it fled.

Ibn Shaprut held up a hand. 'Listen. Can you hear that?'

There was a soft weeping, so soft they would never have heard it if not for the utter silence of the city. They followed the noise, passing along a street and through an archway, into a small, overgrown patio.

Surrounded by greenery, a girl sat on a stone bench, cradling a baby in a filthy blanket.

Ibn Shaprut approached the girl. When he touched her shoulder she flinched, but the doctor had a soothing manner. 'It's all right. No Christians here yet. Let me see your baby. I'm a doctor. I might be able to help.'

Gradually she relaxed. Her face was tear-streaked. She wouldn't let go of the child, but held it out so that Ibn Shaprut could examine it. Ibrahim knew nothing of the health of babies, but it was awake, its eyes alert, and it seemed to smile at Ibn Shaprut; there couldn't be much wrong with it.

Ibrahim thought he recognised the girl. 'I know you. That chiseller Ali Gurdu accused you of thieving.'

Her eyes widened. 'Yes. You're the vizier's vizier. That was what they called you.'

He smiled. 'Well, the vizier is long gone. You can call me Ibrahim. And you are Obona.'

'You helped me. You sent me for food from some people, after I got away from Ali Gurdu.'

'Did they help you?'

'Yes. They took me in as a servant. They were decent. But they found a way to flee, and passed me on to another family. They looked after me too.' Tears leaked from her eyes. 'I woke up this morning, the baby woke me crying, and they had gone. I suppose I'm just a burden to people.'

'Don't think that.'

'Is it true, sir, about the Christians?'

'Is what true?'

She whispered it, eyes wide. 'That they eat babies? I'm so afraid – the things people say-'

'No. Don't think such nonsense. Why, the Christians probably say the same sort of things about us.'

'Your baby's fine,' Ibn Shaprut said, standing up. 'Nothing a good feed and a bit of sunshine wouldn't cure.'

She said, 'But everybody's left. Where am I to go?'

Ibrahim glanced at Ibn Shaprut. 'We'll have to leave soon, like everybody else. You can come with us to Granada. But I can make no guarantees about what you'll find there, for we have no arrangements ourselves.'

'Thank you,' she said earnestly. 'That's enough for me. Anything to get away from these Christians-'

'Leave her.' The voice was imperious.

Ibrahim turned. Subh stood in the arched entrance to the patio. Even now, as the city was in its death throes, a haze of perfume hung around her.

'Mother.'

'You weren't hard to find, you know. Plodding around town with this sullen doctor, still doing your duty, even now. You're as pious as a Christian, Ibrahim.'

'I thought you'd gone. I arranged it-'

'I know what you arranged. I told you. I'm going nowhere, not until we've been to the mosque.'

'Are you still pursuing that foolishness, even now?'

'You don't understand. Things have changed. She's here.'