it. With Villiers dead of heart failure and the paper gone, it would be easy to believe Dr. Ryger's theory that there was no mass transference and never had been. A year or two might pass and our criminal, in possession of the mass transference data, could reveal it little by little, rig experiments, publish careful papers, and end as the apparent discoverer with all that would imply in terms of money and renown. Even his own classmates would suspect nothing. At most they would believe that the long-past affair with Villiers had inspired him to begin investigations in the field. No more.'
Mandel looked sharply from one face to another, 'But none of that will work now. Any of the three of you who comes through with mass transference is proclaiming himself the criminal. I've seen the demonstration; I know it is legitimate; I know that one of you possesses a record of the paper. The information is therefore useless to you. Give it up then.'
Silence.
Mandel walked to the door and turned again. 'I'd appreciate it if you would stay here till I return. I won't be long. I hope the guilty one will use the interval to consider. If he's afraid a confession will lose him his job, let him remember that a session with the police may lose him his liberty and cost him the psychoprobe.' He hefted the three scanners, looked grim and somewhat in need of sleep. 'I'll develop these.'
Kaunas tried to smile. 'What if we make a break for it while you're gone?'
'Only one of you has reason to try,' said Mandel. 'I think I can rely on the two innocent ones to control the third, if only out of self-protection.' He left.
It was five in the morning. Ryger looked at his watch indignantly. 'A hell of a thing. I want to sleep.'
'We can curl up here,' said Talliaferro philosophically. 'Is anyone planning a confession?' Kaunas looked away and Ryger's lip lifted.
'I didn't think so.' Talliaferro closed his eyes, leaned his large head back against the chair, and said in a tired voice, 'Back on the Moon, they're in the slack season. We've got a two-week night and then it's busy, busy. Then there's two weeks of Sun and there's nothing but calculations, correlations, and bull sessions. That's the hard time. I hate it. If there were more women, if I could arrange something permanent...'
In a whisper, Kaunas talked about the fact that it was still impossible to get the entire Sun above the horizon and in view of the telescope on Mercury. But, with another two miles of track soon to be laid down for the observatory- move the whole thing, you know, tremendous forces involved, solar energy used directly-it might be managed. It would be managed.
Even Ryger consented to talk of Ceres after listening to the low murmur of the other voices. There was the problem there of the two-hour rotation period, which meant the stars whipped across the sky at an angular velocity twelve times that in Earth's sky. A net of three light scopes, three radioscopes, three of everything, caught the fields of study from one another as they whirled past.
'Could you use one of the poles?' asked Kaunas.
'You're thinking of Mercury and the Sun,' said Ryger, impatiently. 'Even at the poles the sky would still twist, and half of it would be forever hidden. Now if Ceres showed only one face to the Sun, the way Mercury does, we could have a permanent night sky with the stars rotating slowly once in three years.'
The sky lightened and it dawned slowly.
Talliaferro was half-asleep, but he kept hold of half-consciousness firmly. He would not fall asleep and leave the others awake. Each of the three, he thought, was wondering, 'Who? Who?'
Except the guilty one, of course.
Talliaferro's eyes snapped open as Mandel entered again. The sky, as seen from the window, had grown blue. Talliaferro was glad the window was closed. The hotel was air-conditioned, of course, but windows would be opened during the mild seasons of the year by those Earthmen who fancied the illusion of fresh air. Talliaferro, with Moon vacuum on his mind, shuddered at the thought with real discomfort.
Mandel said, 'Have any of you anything to say?' They looked at him steadily. Ryger shook his head.
Mandel said, 'I have developed the film in your scanners, gentlemen, and viewed the results.' He tossed scanners and developed slivers of film on to the bed. 'Nothing! You'll have trouble sorting out the