Everyone seemed to be following the thread of the conversation but me. I interrupted with, Just a minute, please. Would it be too much to explain what you are talking about?'

There was no rudeness intended, Archibald,' said Mrs Jennings in a voice that made it all right. Joseph has suggested that, since we are stalemated here, we make a sortie into the Half World, smell out this demon, and attack him on his home ground.'

It took me a moment to grasp the simple audacity of the scheme. Then I said, Fine! Let's get on with it. When do we start?'

They lapsed back into a professional discussion that I was unable to follow. Mrs Jennings dragged out several musty volumes and looked up references on points that were sheer Sanskrit to me. Jedson borrowed her almanac, and he and the doctor stepped out into the back yard to observe the moon.

Finally it settled down into an argument - or rather discussion; there could be no argument, as they all deferred to Mrs Jennings's judgement concerning liaison. There seemed to be no satisfactory way to maintain contact with the real world, and Mrs Jennings was unwilling to start until it was worked out. The difficulty was this: not being black magicians, not having signed a compact with Old Nick, they were not citizens of the Dark Kingdom and could not travel through it with certain impunity.

Bodie turned to Jedson. How about Ellen Megeath?' he inquired doubtfully.

Ellen? Why, yes, of course. She would do it. I'll telephone her. Mrs Jennings, do any of your neighbours have a phone?'

Never mind,' Bodie told him, just think about her for a few minutes so that I can get a line-' He stared at Jedson's face for a moment, then disappeared suddenly.

Perhaps three minutes later Ellen Megeath dropped lightly out of nothing. Mr Bodie will be along in a few minutes,' she said. He stopped to buy a packet of cigarettes.' Jedson took her over and presented her to Mrs Jennings. She did look sickly, and I could understand Jedson's concern. Every few minutes she would swallow and choke a little, as if bothered by an enlarged thyroid.

As soon as Jack was back they got right down to details. He had explained to Ellen what they planned to do, and she was entirely willing. She insisted that one more session of magic would do her no harm. There was no advantage in waiting; they prepared to depart at once. Mrs Jennings related the marching orders. Ellen, you will need to follow me in trance, keeping in close rapport. I think you will find that couch near the fireplace a good place to rest your body. Jack, you will remain here and guard the portal.' The chimney of Mrs Jennings's living room fireplace was to be used as most convenient. You will keep in touch with us through Ellen.'

But, Granny, I'll be needed in the Half-'

No, Jack.' She was gently firm. You are needed here much more. Someone has to guard the way and help us back, you know. Each to his task.'

He muttered a bit, but gave in. She went on, I think that is all. Ellen and Jack here; Joseph, Royce, and myself to make the trip. You will have nothing to do but wait, Archibald, but we won't be longer than ten minutes, world time, if we are to come back.' She bustled away towards the kitchen, saying something about the unguent and calling back to Jack to have the candles ready. I hurried after her.

'What do you mean, I demanded, about me having nothing to do but wait? I'm going along!'

She turned and looked at me before replying, troubled concern in her magnificent eyes. I don't see how that can be, Archibald.'

Jedson had followed us and now took me by the arm. See here, Archie, do be sensible. It's utterly out of the question. You're not a magician.'

I pulled away from him. Neither are you.'

Not in a technical sense, perhaps, but I know enough to be useful. Don't be a stubborn fool, man; if you come, you'll simply handicap us.'

That kind of an argument is hard to answer and manifestly unfair. How?' I persisted.

Hell's bells, Archie, you're young and strong and willing, and there is no one I would rather have at my back in a roughhouse, but this is not a job for courage, or even intelligence alone. It calls for special knowledge and experience.'

Well,' I answered, Mrs Jennings has enough of that for a regiment. But - if you'll pardon me, Mrs Jennings! - she is old and feeble. I'll be her muscles if her strength fails.'

Joe looked faintly amused, and I could have kicked him. But that is not what is required in-'

Dr Worthington's double-bass rumble interrupted him from somewhere behind us. It occurs to me, brother, that there may possibly be a use for our young friend's impetuous ignorance. There are times when wisdom is too cautious.'

Mrs Jennings put a stop to it. Wait - all of you,' she commanded, and trotted over to a kitchen cupboard. This she opened, moved aside a package of rolled oats, and took down a small leather sack. It was filled with slender sticks.

She cast them on the floor, and the three of them huddled around the litter, studying the patterns. Cast them again,' Joe insisted. She did so.

I saw Mrs Jennings and the doctor nod solemn agreement to each other. Jedson shrugged and turned away. Mrs Jennings addressed me, concern in her eyes. You will go,' she said softly. It is not safe, but you will go.'

We wasted no more time. The unguent was heated and we took turns rubbing it on each other's backbone. Bodie, as gatekeeper, sat in the midst of his pentacles, mekagrans, and runes, and intoned monotonously from the great book. Worthington elected to go in his proper person, ebony in a breechcloth, parasymbols scribed on him from head to toe, his grandfather's head cradled in an elbow.

There was some discussion before they could decide on a final form for Joe, and the metamorphosis was checked and changed several times. He finished up with paper-thin grey flesh stretched over an obscenely distorted skull, a sloping back, the thin flanks of an animal, and a long, boy tail, which he twitched incessantly. But the whole composition was near enough to human to create a revulsion much greater than would be the case for a more outlandish shape. I gagged at the sight of him, but he was pleased. There!' he exclaimed in a voice like scratched tin. You've done a beautiful job, Mrs Jennings. Asmodeus would not know me from his own nephew.'

I trust not,' she said. Shall we go?'

How about Archie?'

It suits me to leave him as he is.'

Then how about your own transformation?'

I'll take care of that,' she answered, somewhat tartly. Take your places.'

Mrs Jennings and I rode double on the same broom, with me in front, facing the candle stuck in the straws. I've noticed All Hallow's Eve decorations which show the broom with the handle forward and the brush trailing. That is a mistake. Custom is important in these matters. Royce and Joe were to follow close behind us. Seraphin leaped quickly to his mistress' shoulder and settled himself, his whiskers quivering with eagerness.

Bodie pronounced the word, our candle flared up high, and we were off. I was frightened nearly to panic, but tried not to show it as I clung to the broom. The fireplace gaped at us, and swelled to a monster arch. The fire within roared up like a burning forest and swept us along with it. As we swirled up I caught a glimpse of a salamander dancing among the flames, and felt sure that it was my own - the one that had honoured me with its approval and sometimes graced my new fireplace. It seemed a good omen.

We had left the portal far behind - if the word behind' can be used in a place where directions are symbolic - the shrieking din of the fire was no longer with us, and I was beginning to regain some part of my nerve. I felt a reassuring hand at my waist, and turned my head to speak to Mrs Jennings.