Harry's head whirled. 'You can do it? Are you telling me that you can scry out distant events?'

'I see them, yes,' said Mobius, 'but not through any crystal ball. Nor are they strictly distant. Distance is relative. I go there. I go where the events I wish to watch are scheduled to occur.'

'But... where do you go? How?'

'"How" is the difficult bit,' said Mobius. 'Where is far easier. Harry, in life I wasn't only a mathematician but also an astronomer. After I died, naturally I was restricted to maths. But astronomy was in me; it was part of me; it would not let me be. And everything comes to those who wait. As time passed I began to feel the stars shining down on me, through the day as well as the night. I became aware of their weight - their mass, if you like -their great distance, the distances between them. Soon I knew far more about them than ever I had known in life, and then I determined to go and see them for myself. When you came to me I was calculating the magnitude of a nova soon to occur in Andromeda, and I shall be there

to see it happen! Why not? I am unbodied. The laws of the physical universe no longer apply.'

'But you've just denied the metaphysical,' Harry pro tested. 'And now you're saying you can teleport to the stars!'

Teleportation? No, for nothing physical is moved. As I keep telling you, Harry, I am not a physical thing. There may well be a so-called "metaphysical" universe, but neither the real nor the unreal may impose itself upon the other.'

'Or so you believed until you met me!' said Harry, his strange eyes opening wider, his voice full of a new awe. For suddenly a bright star was shining in Harry's mind, but shining brighter than any nova in the mind of Mobius.

'What? What's that?'

'Are you saying,' Harry became relentless, 'that there is no meeting point between the physical and the meta-physical? Is that your argument?' 'Exactly!'

'And yet I am physical, and you are purely mental -and we have met!

He sensed the other's gape. 'Astonishing! It seems I've overlooked the obvious.'

Harry pressed his advantage: 'You use the strip, don't you, to go out amongst the stars?'

'The strip? I use a variant of it, yes, but - '

'And you called me a Zollnerist?'

For a moment Mobius was speechless. Then: 'It seems my arguments ... no longer apply!'

'You do teleport!' said Harry. 'You teleport pure mind. You're a scryer. That's your talent, sir! In a way it always was. Even in life you could-see things that others were blind to. The strip is a perfect example. Well, scrying in itself would be a marvellous weapon, but I want to take it a step farther. I want to impose -I mean rigidly impose -the physical me on the metaphysical universe.'

'Please, Harry, not so fast!' Mobius protested. 'I need to-'

'Sir, you offered to teach me,' Harry couldn't be restrained. 'Well, I accept. But only teach me what's absolutely necessary. Let my instinct, my intuition do the rest. My mind's a blackboard, and you've got the chalk right there in your hand. So go ahead, teach me ...

Teach me how to ride your Mobius strip!'

It was night again and Dragosani had climbed back into the cruciform hills. Across his back he carried a second ewe, this one stunned with a large stone. The day had been a busy one, but its proceeds must surely show a profit; Max Batu had had the chance to display yet again the morbid power of his evil eye, this time to one Ladislau Giresci; eventually the old man would be found in his lonely house, 'victim of a heart attack', of course.

But Max's work had not stopped there, for only an hour or so ago Dragosani had sent the Mongolian out upon another crucial mission; which meant that the necro­mancer was now alone - or to all intents and purposes alone - as he approached the tomb of the vampire and sent his words and thoughts before him to penetrate the cold gloom beneath dark and stirless trees.

'Thibor, are you sleeping? I'm here as directed. The stars are bright and the night chill, and the moon is creeping on the hills. This is the hour, Thibor - for both of us.'

And after a moment: Ahhhh! ... Dragosaaaniiti? Sleeping? I suppose I was. But I have slept a grand sleep, Dragosani. The sleep of the undead. And I dreamed a grand dream - of conquest and of empire! And for once my hard bed was soft as the breasts of a lover, and these old, old bones were not weighed down but buoyant as the step of a lad when he meets his lass. A grand dream, aye, but... alas, only a dream for all that.

Dragosani sensed... despondency? Alarmed for his plan, he asked: 'Is anything wrong?'

On the contrary. All goes well, my son - except I fear it may take a little longer than I thought. I took strength from your offering of yestereve, indeed I did! - and I fancy I've even put on a little flesh. But still the ground is hard and these old sinews of mine stiff from the salts of the earth...

And then, more eagerly: But did you remember, Drago­sani, and bring me another small tribute? Not too small, I hope? Something, perhaps, to compare with my last repast?

For answer the necromancer came to a halt on the rim of the circle, tossed down from his shoulder to the ground at his feet the inert mass of the ewe in a grunting heap. 'I didn't forget,' he said. 'But come on, old dragon, tell me what you mean. Why will it take longer than you thought?' Dragosani's disappointment was real; his plan depended upon raising the vampire up tonight.

Have you no understanding, Dragosani? came Thibor's answer. Among the men who followed me when I was a warrior, many were so injured in battle that they were carried to their beds. Some would recover. But after months of lying still, often they were wasted and full of aches and torments. Picture me, then, after five hundred years! But... we shall see what we shall see. Even as we talk I grow more eager to be risen up - and so perhaps, after a little more refreshment - ?

Dragosani wryly nodded his understanding, drew out a " small glinting sickle of honed brightness from its sheath in his pocket, and stooped towards the ewe.

Hold! said the vampire. As you surmise, Dragosani, this may well be the hour - for both of us. An hour of great moment! For both of us. For my own part, I think we should treat it with the respect it warrants.

The necromancer frowned, cocked his head on one side. 'How do you mean?'

So far, my son, I think you would agree that I have not stood on ceremony. For all that I have had my food hurled at me, as if I were some rooting pig, I have not complained. But I would have you know, Dragosani, that I too have supped at table. Indeed, I've dined in the courts of princes! - aye, and will again, with you perhaps seated upon my right hand. May I not, therefore, expect treatment more nearly gracious? Or must I always remember you as a man who poured my food over me like slops into a pigsty?

'A bit late for niceties, isn't it, Thibor?' Dragosani wondered what the vampire was up to. 'What exactly do you want?'

Thibor was quick to note his apprehension. What? And do you still distrust me? Well, and I suppose you have your reasons. Survival was mine. But come, have we not agreed that when I'm up and about, then that I'll drive out the seed of my own flesh from your body? And in that moment, will you not be entirely in my hands? It seems a foolish thing, Dragosani, that you would put your faith in me walking abroad but not in my grave! Surely if I were so inclined, I'd be capable of more harm to you up than down? Also, if it were my plan to harm you, who then would be my guide in this new world I'm about to enter? You shall instruct me, Dragosani, and I you.