it. If you want my opinion, sir, he was mad. For ten years he was a prisoner of Earth and he fantasied mass transference as escape. It was all that kept him alive probably. He rigged up some sort of fraudulent demonstration. I don't say it was deliberate fraud. He was probably madly sincere, and sincerely mad. Last evening was the climax. He came to our rooms-he hated us for having escaped Earth-and triumphed over us. It was what he had lived for for ten years. It may have shocked him back to some form of sanity. He knew he couldn't actually give the paper; there was nothing to give. So he burned it and his heart gave out. It is too bad.'
Mandel listened to the Cerian astronomer, wearing a look of sharp disapproval. He said, 'Very glib, Dr. Ryger, but quite wrong. I am not so easily fooled by fraudulent demonstrations as you may believe. Now according to the registration data, which I have been forced to check rather hastily, you three were his classmates at college. Is that right?'
They nodded.
'Are there any other classmates of your present at the Convention?'
'No,' said Kaunas. 'We were the only four qualifying for a doctorate in astronomy that year. At least he would have qualified except-'
'Yes, I understand,' said Mandel. 'Well, then, in that case one of you three visited Villiers in his room one last time at midnight.'
There was a short silence. Then Ryger said coldly, 'Not I.' Kaunas, eyes wide, shook his head. Talliaferro said, 'What are you implying?'
'One of you came to him at midnight and insisted on seeing his paper. I don't know the motive.
Conceivably it was with the deliberate intention of forcing him into heart failure. When Villiers collapsed, the criminal, if I may call him so, was ready. He snatched the paper, which, I might add, probably was kept under his pillow, and scanned it. Then he destroyed the paper itself in the flash-disposal, but he was in a hurry and destruction wasn't complete.'
Ryger interrupted. 'How do you know all this? Were you a witness?'
'Almost,' said Mandel. 'Villiers was not quite dead at the moment of his first collapse. When the criminal left, he managed to reach the phone and call my room. He choked out a few phrases, enough to outline what had occurred. Unfortunately I was not in my room; a late conference kept me away. However, my recording attachment taped it. I always play the recording tape back whenever I return to my room or office. Bureaucratic habit. I called back. He was dead.'
'Well, then,' said Ryger, 'who did he say did it?'
'He didn't. Or if he did, it was unintelligible. But one word rang out clearly. It was classmate.' Talliaferro detached his scanner from its place in his inner jacket pocket and held it out toward Mandel. Quietly he said, 'If you would like to develop the film in my scanner, you are welcome to do so. You will not find Villiers' paper there.'
At once Kaunas did the same, and Ryger, with a scowl, joined.
Mandel took all three scanners and said dryly, 'Presumably, whichever one of you has done this has already disposed of the piece of exposed film with the paper on it. However-'
Talliaferro raised his eyebrows. 'You may search my person or my room.'
But Ryger was still scowling. 'Now wait a minute, wait one bloody minute. Are you the police?'
Mandel stared at him. 'Do you want the police? Do you want a scandal and a murder charge? Do you want the Convention disrupted and the System press making a holiday out of astronomy and astronomers? Villiers' death might well have been accidental. He did have a bad heart. Whichever one of you was there may well have acted on impulse. It may not have been a premeditated crime. If whoever it is will return the negative, we can avoid a great deal of trouble.'
'Even for the criminal?' asked Talliaferro.
Mandel shrugged. There may be trouble for him. I will not promise immunity. But whatever the trouble, it won't be public disgrace and life imprisonment, as it might be if the police are called in.'
Silence.
Mandel said, 'It is one of you three.' Silence.
Mandel went on, 'I think I can see the original reasoning of the guilty person. The paper would be destroyed. Only we four knew of the mass transference and only I had ever seen a demonstration. Moreover you had only his word, a madman's word perhaps, that I had seen