"The men with the Geiger counters must get results in the end. The number of planes to be examined is limited. Just a trace of radio- number of planes to be examined is limited. Just a trace of radio- activity and we shall know that is the plane we are looking for -" activity and we shall know that is the plane we are looking for -"

"If your agent has been able to use the spray. Alas! Always so many 'ifs'..."

"We shall get there," said Jessop obstinately. "I wonder -"

"Yes?"

"We have a.s.sumed they are going north - towards the Mediterranean - suppose instead, they flew south." Mediterranean - suppose instead, they flew south."

"Doubled back on their tracks? But where, then, could they be flying to? There are the mountains of the High Atlas - and after that flying to? There are the mountains of the High Atlas - and after that the desert sands." the desert sands."

II.

"Sidi, you swear to me that it will be as you have promised? A petrol station in America, in Chicago? It is certain?" station in America, in Chicago? It is certain?"

"It is certain, Mohammed, if we get out of here, that is."

"Success depends on the will of Allah."

"Let us hope, then, that it is the will of Allah that you should have a petrol station in Chicago. Why Chicago?" petrol station in Chicago. Why Chicago?"

"Sidi, the brother of my wife went to America, and he has there a petrol pump in Chicago. Do I want to remain in a backward part of petrol pump in Chicago. Do I want to remain in a backward part of the world all my days? Here there is money and much food and the world all my days? Here there is money and much food and many rugs and women - but it is not modern. It is not America." many rugs and women - but it is not modern. It is not America."

Peters looked thoughtfully into the dignified black face. Mohammed in his white robes was a magnificent sight. What strange desires in his white robes was a magnificent sight. What strange desires rose in the human heart! rose in the human heart!

"I don't know that you're wise," he said with a sigh, "but so be it. Of course, if we are found out -" course, if we are found out -"

A smile on the black face revealed beautiful white teeth.

"Then it is death - for me certainly. Perhaps not for you, Sidi, since you are valuable." you are valuable."

"They deal out death rather easily here, do they?"

The shoulders of the other man rose and fell contemptuously.

"What is death? That, too, is the will of Allah."

"You know what you have to do?"

"I know, Sidi. I am to take you to the roof after dark. Also I am to put in your room clothing such as I and the other servants wear. Later - in your room clothing such as I and the other servants wear. Later - there will be other things." there will be other things."

"Right. You'd better let me out of the lift now. Somebody may notice we're riding up and down. It may give them ideas." we're riding up and down. It may give them ideas."

III.

There was dancing going on. Andy Peters was dancing with Miss Jennsen. He held her close to him, and seemed to be murmuring in Jennsen. He held her close to him, and seemed to be murmuring in her ear. As they revolved slowly near where Hilary was standing he her ear. As they revolved slowly near where Hilary was standing he caught her eye and immediately gave her an outrageous wink. caught her eye and immediately gave her an outrageous wink.

Hilary, biting her lip to avoid a smile, averted her eyes quickly.

Her glance fell on Betterton who was standing just across the room talking to Torquil Ericsson. Hilary frowned a little as she watched talking to Torquil Ericsson. Hilary frowned a little as she watched them. them.

"Have a turn with me, Olive?" said Murchison's voice at her elbow.

"Yes, of course, Simon."

"Mind you, I'm not very hot at dancing," he warned her.

Hilary concentrated on keeping her feet where he could not possibly tread on them. possibly tread on them.

"It's exercise, that's what I say," said Murchison, panting slightly. He was an energetic dancer. He was an energetic dancer.

"Awfully jolly frock you've got on, Olive."

His conversation seemed always to come out of an old-fashioned novel. novel.

"I'm glad you like it," said Hilary.

"Get it out of the Fashion Department?"

Resisting the temptation to reply: "Where else?" Hilary merely said, "Yes."

"Must say, you know," panted Murchison as he capered perseveringly round the floor, "they do you jolly well here. Said so perseveringly round the floor, "they do you jolly well here. Said so to Bianca only the other day. Beats the Welfare State every time. No to Bianca only the other day. Beats the Welfare State every time. No worries about money, or income tax - or repairs or upkeep. All the worries about money, or income tax - or repairs or upkeep. All the worrying done for you. Must be a wonderful life for a woman, I worrying done for you. Must be a wonderful life for a woman, I should say." should say."

"Bianca finds it so, does she?"

"Well, she was restless for a bit, but now she's managed to get up a few committees and organise one or two things - debates, you few committees and organise one or two things - debates, you know, and lectures. She's complaining that you don't take as much know, and lectures. She's complaining that you don't take as much part as you might in things." part as you might in things."

"I'm afraid I'm not that kind of person, Simon. I've never been very public spirited." public spirited."

"Yes, but you girls have got to keep yourselves amused one way or another. At least I don't mean amused exactly -" another. At least I don't mean amused exactly -"

"Occupied?" suggested Hilary.

"Yes - I mean the modern woman wants to get her teeth into something. I quite realise that women like you and Bianca have something. I quite realise that women like you and Bianca have made a definite sacrifice coming here - you're neither of you made a definite sacrifice coming here - you're neither of you scientists, thank goodness - really, these scientific women! scientists, thank goodness - really, these scientific women!

Absolutely the limit, most of them! I said to Bianca, 'Give Olive time, she's got to get tuned in.' It takes a little time getting used to this she's got to get tuned in.' It takes a little time getting used to this place. To begin with, one gets a kind of claustrophobic feeling. But place. To begin with, one gets a kind of claustrophobic feeling. But it wears off - it wears off..." it wears off - it wears off..."

"You mean - one can get used to anything?"

"Well, some people feel it more than others. Tom, now, seems to take it hard. Where's old Tom tonight? Oh yes, I see, over there with take it hard. Where's old Tom tonight? Oh yes, I see, over there with Torquil. Quite inseparable, those two." Torquil. Quite inseparable, those two."

"I wish they weren't. I mean, I shouldn't have thought they had very much in common." much in common."

"Young Torquil seems fascinated by your husband. He follows him round everywhere." round everywhere."

"I've noticed it. I wondered - why?"

"Well, he's always got some outlandish theory to get off his chest - it's beyond my power to follow him - his English isn't too good, as it's beyond my power to follow him - his English isn't too good, as you know. But Tom listens and manages to take it all in." you know. But Tom listens and manages to take it all in."

The dance ended. Andy Peters came up and claimed Hilary for the next one. next one.

"I observed you suffering in a good cause," he said. "How badly did you get trampled?" you get trampled?"

"Oh, I was fairly agile."

"You noticed me doing my stuff?"

"With the Jennsen?"

"Yes. I think I may say without undue modesty that I have made a hit, a palpable hit in that quarter. These plain angular short-sighted hit, a palpable hit in that quarter. These plain angular short-sighted girls respond immediately when given the treatment." girls respond immediately when given the treatment."

"You certainly gave the impression of having fallen for her."

"That was the idea. That girl, Olive, properly handled, can be very useful. She's in the know about all the arrangements here. For useful. She's in the know about all the arrangements here. For instance, tomorrow there's a party of various V.I.P.'s due here. instance, tomorrow there's a party of various V.I.P.'s due here. Doctors and a few Government officials and a rich patron or two." Doctors and a few Government officials and a rich patron or two."

"Andy - do you think there might be a chance..."

"No, I don't. I bet that's going to be taken care of. So don't cherish false hopes. But it will be valuable because we'll get an idea of the false hopes. But it will be valuable because we'll get an idea of the procedure. And on the next occasion - well, there might be procedure. And on the next occasion - well, there might be something doing. So long as I can keep the Jennsen eating out of something doing. So long as I can keep the Jennsen eating out of my hand, I can get a lot of miscellaneous information out of her." my hand, I can get a lot of miscellaneous information out of her."

"How much do the people who are coming know?"

"About us - the Unit, I mean - nothing at all. Or so I gather. They just inspect the settlement and the medical research laboratories. This inspect the settlement and the medical research laboratories. This place has been deliberately built like a labyrinth, just so that place has been deliberately built like a labyrinth, just so that n.o.body coming into it can possibly guess its extent. I gather there n.o.body coming into it can possibly guess its extent. I gather there are kinds of bulkheads that close, and that shut off our area." are kinds of bulkheads that close, and that shut off our area."

"It all seems so incredible."

"I know. Half the time one feels one must be dreaming. One of the unreal things here is never seeing any children about. Thank unreal things here is never seeing any children about. Thank goodness there aren't! You must be thankful you haven't got a goodness there aren't! You must be thankful you haven't got a child." child."

He felt the sudden stiffening of her body.

"Here - I'm sorry - I said the wrong thing!" He led her off the dance floor and to a couple of chairs. floor and to a couple of chairs.

"I'm very sorry," he repeated. "I hurt you, didn't I?"

"It's nothing - no, really not your fault. I did have a child - and it died -that's all."

"You had a child?" he stared, surprised. "I thought you'd only been married to Betterton six months?" married to Betterton six months?"

Olive flushed. She said quickly, "Yes, of course. But I was - married before. I divorced my first husband." husband."

"Oh, I see. That's the worst of this place. One doesn't know anything about people's lives before they came here, and so one anything about people's lives before they came here, and so one goes and says the wrong thing. It's odd to realise sometimes that I goes and says the wrong thing. It's odd to realise sometimes that I don't know anything about you at all." don't know anything about you at all."

"Or I anything about you. How you were brought up - and where - your family -" your family -"

"I was brought up in a strictly scientific atmosphere. Nourished on test tubes, you might say. n.o.body ever thought or talked of test tubes, you might say. n.o.body ever thought or talked of anything else. But I was never the bright boy of the family. Genius anything else. But I was never the bright boy of the family. Genius lay elsewhere." lay elsewhere."

"Where exactly?"

"A girl. She was brilliant. She might have been another Madame Curie. She could have opened up new horizons..." Curie. She could have opened up new horizons..."

"She - what happened to her?"

He said shortly: "She was killed."

Hilary guessed at some wartime tragedy. She said gently, "You cared for her?"

"More than I have ever cared for anybody."

He roused himself suddenly.

"What the heck - we've got enough troubles in the present, right here and now. Look at our Norwegian friend. Apart from his eyes, here and now. Look at our Norwegian friend. Apart from his eyes, he always looks as though he were made from wood. And that he always looks as though he were made from wood. And that wonderful little stiff bow of his - as though you'd pulled a string." wonderful little stiff bow of his - as though you'd pulled a string."

"It's because he's so very tall and thin."

"Not so very tall. About my height - five foot eleven or six foot, not more." more."

"Height is deceptive."

"Yes, it's like descriptions on pa.s.sports. Take Ericsson. Height six foot, fair hair, blue eyes, face long, demeanour wooden, nose foot, fair hair, blue eyes, face long, demeanour wooden, nose medium, mouth ordinary. Even add what a pa.s.sport wouldn't - medium, mouth ordinary. Even add what a pa.s.sport wouldn't - speaks correctly but pedantically - you still wouldn't have the first speaks correctly but pedantically - you still wouldn't have the first idea what Torquil really looked like. What's the matter?" idea what Torquil really looked like. What's the matter?"

"Nothing."

She was staring across the room at Ericsson. That description of Boris Glydr! Almost word for word as she had heard it from Jessop. Boris Glydr! Almost word for word as she had heard it from Jessop. Was that why she had always felt nervous of Torquil Ericsson? Was that why she had always felt nervous of Torquil Ericsson?

Could it possibly be that - Turning abruptly to Peters she said, "I suppose he is Ericsson? He couldn't be someone else?"

Peters looked at her in astonishment.

"Someone else? Who?"

"I mean - at least I think I mean - could he have come here pretending to be Ericsson?" pretending to be Ericsson?"

Peters considered.

"I suppose - no, I don't think that would be feasible. He'd have to be a scientist... and anyway, Ericsson is quite well known." a scientist... and anyway, Ericsson is quite well known."

"But n.o.body here seems ever to have met him before - or I suppose he could be Ericsson, but be someone else as well." he could be Ericsson, but be someone else as well."

"You mean Ericsson could have been leading some kind of double life? That's possible, I suppose. But it's not very likely." life? That's possible, I suppose. But it's not very likely."

"No," said Hilary. "No, of course it isn't likely."

Of course Ericsson was not Boris Glydr. But why should Olive Betterton have been so insistent on warning Tom against Boris? Betterton have been so insistent on warning Tom against Boris?

Could it have been because she knew that Boris was on his way to the Unit? Supposing the man who had come to London calling the Unit? Supposing the man who had come to London calling himself Boris Glydr was not Boris Glydr at all? Supposing that he himself Boris Glydr was not Boris Glydr at all? Supposing that he was really Torquil Ericsson. The description fitted. Ever since he was really Torquil Ericsson. The description fitted. Ever since he arrived at the Unit, he had focused his attention on Tom. Ericsson, arrived at the Unit, he had focused his attention on Tom. Ericsson, she was sure, was a dangerous person, you didn't know what went she was sure, was a dangerous person, you didn't know what went on behind those pale dreamy eyes... on behind those pale dreamy eyes...

She shivered.

"Olive - what's the matter? What is it?"