The passengers rose. Saul swung his bag over his shoulder and shuffled out of the carriage. Freezing air stretched up to the great vaulted ceilings. The cold shocked him. Saul hurried through the buildings, through the crowds, threading his way between knots of people. He still had a way to go. He headed underground.

He could feel the presence of the population around him. After days in a tent on the Suffolk coast, the weight of ten million people so close to him seemed to make the air vibrate. The tube was full of garish colours and bare flesh, as people headed to clubs and parties.

His father would probably be waiting for him. He knew Saul was coming back, and he would surely make an effort to be welcoming, forfeiting his usual evening in the pub to greet his son. Saul already resented him for that. He felt gauche and uncharitable, but he despised his father’s faltering attempts to communicate. He was happier when the two of them avoided each other. Being surly was easy, and felt more honest.

By the time his tube train burst out of the tunnels of the Jubilee Line it was dark. Saul knew the route. The darkness transformed the rubble behind Finchley Road into a dimly glimpsed no-man’s-land, but he was able to fill in the details he could not see, even down to the tags and the graffiti. Burner. Nax. Coma. He knew the names of the intrepid little rebels clutching their magic markers, and he knew where they had been.

The grandiose tower of the Gaumont State cinema jutted into the sky on his left, a bizarre totalitarian monument among the budget groceries and hoardings of Kilburn High Road. Saul could feel the cold through the windows and he wrapped his coat around him as the train neared Willesden station. The passengers had thinned. Saul left only a very few behind him as he got out of the carriage.

Outside the station he huddled against the chill. The air smelt faintly of smoke from some local bonfire, someone clearing his allotment. Saul set off down the hill towards the library.

He stopped at a takeaway and ate as he walked, moving slowly to avoid spilling soy sauce and vegetables down himself. Saul was sorry the sun had gone down. Willesden lent itself to spectacular sunsets. On a day like today, when there were few clouds, its low skyline let the light flood the streets, pouring into the strangest crevices; the windows that faced each other bounced the rays endlessly back and forth between themselves and sent it hurtling in unpredictable directions; the rows and rows of brick glowed as if lit from within.

Saul turned into the backstreets. He wound through the cold until his father’s house rose before him. Terragon Mansions was an ugly Victorian block, squat and mean-looking for all its size. It was fronted by the garden: a strip of dirty vegetation frequented only by dogs. His father lived on the top floor. Saul looked up and saw that the lights were on. He climbed the steps and let himself in, glancing into the darkness of the bushes and scrub on either side.

He ignored the huge lift with its steel-mesh door, not wanting its groans to announce him. Instead he crept up the flights of stairs and gently unlocked his father’s door.

The flat was freezing.

Saul stood in the hall and listened. He could hear the sound of the television from behind the sitting room door. He waited, but his father was silent. Saul shivered and looked around him.

He knew he should go in, should rouse his father from slumber, and he even got as far as reaching for the door. But he stopped and looked at his own room.

He sneered at himself in disgust, but he crept towards it anyway.

He could apologize in the morning. I thought you were asleep, Dad. I heard you snoring. I came in drunk and fell into bed. I was so knackered I wouldn’t have been any kind of company anyway. He cocked an ear, heard only the voices of one of the late-night discussion programmes his father so loved, muffled and pompous. Saul turned away and slipped into his room.

Sleep came easily. Saul dreamed of being cold, and woke once in the night to pull his duvet closer. He dreamed of slamming, a heavy beating noise, so loud it pulled him out of sleep and he realized it was real, it was there. Adrenaline surged through him, making him tremble. His heart quivered and lurched as he swung out of bed.

It was icy in the flat. Someone was pounding on the front door.

The noise would not stop, it was frightening him. He was shaking, disorientated. It was not yet light. Saul glanced at his clock. It was a little after six. He stumbled into the hall. The horrible bang bang bang was incessant, and now he could hear shouting as well, distorted and unintelligible.

He fought into a shin and shouted: ‘Who is it?’

The slamming did not stop. He called out again, and this time a voice was raised above the din.

‘Police!’

Saul struggled to clear his head. With a sudden panic he thought of the small stash of dope in his drawer, but that was absurd. He was no drugs kingpin, no one would waste a dawn raid on him. He was reaching out to open the door, his heart still tearing, when he suddenly remembered to check that they were who they claimed, but it was too late now, the door flew back and knocked him down as a torrent of bodies streamed into the flat.

Blue trousers and big shoes all around him. Saul was yanked to his feet. He started to flail at the intruders. Anger waxed with his fear. He tried to yell but someone smacked him in the stomach and he doubled up. Voices were reverberating everywhere around him, making no sense.

‘… cold like a bastard…’

‘… cocky little cunt…’

‘… fucking glass, watch yourself…’

‘… his son, or what? High as a fucking kite, must be…’

And above all these voices he could hear a weather forecast, the cheery tones of a breakfast television presenter. Saul struggled to turn and face the men who were holding him so tight.

‘What the fuck’s going on?’ he gasped. Without speaking, the men propelled him into the sitting room.

The room was full of police, but Saul saw straight through them. He saw the television first: the woman in the bright suit was warning him it would be chilly again today. On the sofa was a plate of congealed pasta, and a half-drunk glass of beer sat on the floor. Cold gusts of air caught at him and he looked up at the window, out over houses. The curtains were billowing dramatically. He saw that jags of glass littered the floor. There was almost no glass left in the window-frame, only a few shards around the edges.

Saul sagged with terror and tried to pull himself to the window.

A thin man in civilian clothes turned and saw him.

‘Down the station now,’ he shouted at Saul’s captors.

Saul was spun on his heels. The room turned around him like a funfair ride, the rows of books and his father’s small pictures rushing past him. He struggled to turn back.

‘Dad!’ he shouted. ‘Dad!’

He was pulled effortlessly out of the flat. The dark of the corridor was pierced by slivers of light spilling out of doors. Saul saw uncomprehending faces and hands clutching at dressing-gowns, as he was hauled towards the lift. Neighbours in pyjamas were staring at him. He bellowed at them as he passed.

He still could not see the men holding him. He shouted at them, begging to know what was going on, pleading, threatening and railing.

‘Where’s my dad? What’s going on?’

‘Shut up.’

‘What’s going on?’

Something slammed into his kidneys, not hard but with the threat of greater force. ‘Shut up.’ The lift door closed behind them.

‘What’s happened to my fucking dad!’

As soon as he had seen the broken window a voice inside Saul had spoken quietly. He had not been able to hear it clearly until now. Inside the flat the brutal crunch of boots and the swearing had drowned it out. But here where he had been dragged, in the relative silence of the lift, he could hear it whispering.