‘What is it?’ she demanded. ‘Poltergeist? Ghost? Mother’s ghost?’

The thought of his dead wife being responsible for such wholesale destruction struck Jack as funny.

Amanda was half smiling. Good, he thought, she’s coming out of it. Then he met the vacant look in her eyes and the truth dawned. She’d broken, her sanity had taken refuge where this fantastique couldn’t get at it. ‘What’s in there?’ Gina was asking, her grip on his arm so strong it stopped the blood.

‘I don’t know,’ he lied. ‘Amanda?’

Amanda’s smile didn’t decay. She just stared on at him, through him.

‘You do know.’

‘No.’

‘You’re lying.’

‘I think...’

He picked himself off the floor, brushing the pieces of porcelain, the feathers, the glass, off his shirt and trousers.

‘I think ... I shall go for a walk.’

Behind him, in the lounge, the last vestiges of whining had stopped. The air in the hallway was electric with unseen presences. It was very close to him, invisible as ever, but so close. This was the most dangerous time. He mustn’t lose his nerve now. He must stand up as though nothing had happened; he must leave Amanda be, leave explanations and recriminations until it was all over and done with. ‘Walk?’ Gina said, disbelievingly. ‘Yes… walk… I need some fresh air.’ ‘You can’t leave us here.’

‘I’ll find somebody to help us clear up.’ ‘But Mandy.’

‘She’ll get over it. Leave her be.’

That was hard. That was almost unforgivable. But it was said now.

He walked unsteadily towards the front door, feeling nauseous after so much spinning. At his back Gina was raging.

‘You can’t just leave! Are you out of your mind?’

‘I need the air,’ he said, as casually as his thumping heart and his parched throat would permit. ‘So I’ll just go out for a moment.’

No, the Yattering said. No, no, no.

It was behind him, Polo could feel it. So angry now, so ready to twist off his head. Except that it wasn’t allowed, ever to touch him. But he could feel its resentment like a physical presence.

He took another step towards the front door.

It was with him still, dogging his every step. His shadow, his fetch; unshakeable. Gina shrieked at him, ‘You son-of-a-bitch, look at Mandy! She’s lost her mind!’

No, he mustn’t look at Mandy. If he looked at Mandy he might weep, he might break down as the thing wanted him to, then everything would be lost.

‘She’ll be all right,’ he said, barely above a whisper. He reached for the front door handle. The demon bolted the door, quickly, loudly. No temper left for pretence now.

Jack, keeping his movements as even as possible, unbolted the door, top and bottom. It bolted again.

It was thrilling, this game; it was also terrifying. If he pushed too far surely the demon’s frustration would override its lessons? Gently, smoothly, he unbolted the door again. Just as gently, just as smoothly, the Yattering bolted it.

Jack wondered how long he could keep this up for. Somehow he had to get outside: he had to coax it over the threshold. One step was all that the law required, according to his researches.

One simple step.

Unbolted. Bolted. Unbolted. Bolted.

Gina was standing two or three yards behind her father. She didn’t understand what she was seeing, but it was obvious her father was doing battle with someone, or something.

‘Daddy —‘ she began.

‘Shut up,’ he said benignly, grinning as he unbolted the door for the seventh time. There was a shiver of lunacy in the grin, it was too wide and too easy.

Inexplicably, she returned the smile. It was grim, but genuine. Whatever was at issue here, she loved him.

Polo made a break for the back door. The demon was three paces ahead of him, scooting through the house like a sprinter, and bolting the door before Jack could even reach the handle. The key was turned in the lock by invisible hands, then crushed to dust in the air.

Jack feigned a move towards the window beside the back door but the blinds were pulled down and the shutters slammed. The Yattering, too concerned with the window to watch Jack closely, missed his doubling back through the house.

When it saw the trick that was being played it let out a little screech, and gave chase, almost sliding into Jack on the smoothly-polished floor. It avoided the collision only by the most balletic of manoeuvres. That would be fatal indeed: to touch the man in the heat of the moment.

Polo was again at the front door and Gina, wise to her father’s strategy, had unbolted it while the Yattering and Jack fought at the back door. Jack had prayed she’d take the opportunity to open it. She had. It stood slightly ajar:

The icy air of the crisp afternoon curled its way into the hallway.

Jack covered the last yards to the door in a flash, feeling without hearing the howl of complaint the Yattering loosed as it saw its victim escaping into the outside world.

It was not an ambitious creature. All it wanted at that moment, beyond any other dream, was to take this human’s skull between its palms and make a nonsense of it. Crush it to smithereens, and pour the hot thought out on to the snow. To be done with Jack J. Polo, forever and forever.

Was that so much to ask?

Polo had stepped into the squeaky-fresh snow, his slippers and trouser-bottoms buried in chill. By the time the fury reached the step Jack was already three or four yards away, marching up the path towards the gate. Escaping. Escaping.

The Yattering howled again, forgetting its years of training. Every lesson it had learned, every rule of battle engraved on its skull was submerged by the simple desire to have Polo’s life.

It stepped over the threshold and gave chase. It was an unpardonable transgression. Somewhere in Hell, the powers (long may they hold court; long may they shit light on the heads of the damned) felt the sin, and knew the war for Jack Polo’s soul was lost.

Jack felt it too. He heard the sound of boiling water, as the demon’s footsteps melted to steam the snow on the path. It was coming after him! The thing had broken the first rule of its existence. It was forfeit. He felt the victory in his spine, and his stomach.

The demon overtook him at the gate. Its breath could clearly be seen in the air, though the body it emanated from had not yet become visible. Jack tried to open the gate, but the Yanering slammed it shut.

‘Che sera, sera,’ said Jack.

The Yattering could bear it no longer. He took Jack’s head in his hands, intending to crush the fragile bone to dust.

The touch was its second sin; and it agonized the Yattering beyond endurance. It bayed like a banshee and reeled away from the contact, sliding in the snow and falling on its back.

It knew its mistake. The lessons it had had beaten into it came hurtling back. It knew the punishment too, for leaving the house, for touching the man. It was bound to a new lord, enslaved to this idiot-creature standing over it.

Polo had won.

He was laughing, watching the way the outline of the demon formed in the snow on the path. Like a photograph developing on a sheet of paper, the image of the fury came clear. The law was taking its toll. The Yattering could never hide from its master again. There it was, plain to Polo’s eyes, in all its charmless glory. Maroon flesh and bright lidless eye, arms flailing, tail thrashing the snow to slush.

‘You bastard,’ it said. Its accent had an Australian lilt.

‘You will not speak unless spoken to,’ said Polo, with quiet, but absolute, authority. ‘Understood?’

The lidless eye clouded with humility.

‘Yes,’ the Yattering said.

‘Yes, Mister Polo.’

‘Yes, Mister Polo.’

Its tail slipped between its legs like that of a whipped dog.

‘You may stand.’

‘Thank you, Mr Polo.’ It stood. Not a pleasant sight, but one Jack rejoiced in nevertheless.