hand on Horitz's arm. "Please," she said, "don't be hasty. We don't know that Oscar understands, remember. Let's at least run through the rest of the passenger list, and see if he picks out anyone else."

"I never heard such nonsense in my life," put in Mrs. Jahore, who was small and sultry. "Come along, Carson, let's go and tell the captain."

"I've already buzzed the captain," said Horitz. He glanced at Dr. Ilyanov. "You're right, of course. Walsh, take Ambassador and Mrs. Jahore into the other room. If they make any trouble, give them a jolt."

Walsh, with his electrogun out, herded the pair into the next room. Jahore's shouts continued for some time.

"Ask Oscar if he was sure," suggested Sommers.

Dr. Ilyanov stepped to the Morse sender and tapped out the message.

Tick-tick, said Oscar.

"Well, that's good enough for me," said Sommers, "but we might as well have the rest in, I suppose."

The captain called Horitz via his wrist phone, swore fearfully when he heard that they had bagged the ambassador, and promised to come down later. Horitz continued to read off lists of names to the central operator, bringing in groups of passengers whose nervousness increased as rumors spread through the ship.

Horitz strode up and down the room, slamming one fist into the palm of the other hand. "There must be something we've overlooked," he said. "We've got to figure out what the semantic block is between us and Oscar. I know it's something simple, I feel it; but—"

Dr. Ilyanov was frowning thoughtfully. "I have an idea," she said. "Did it ever occur to you that Dr. Tooker might be the man we are looking for?"

"Tooker!" said Horitz.

"Yes. You saw how jealous he is of his job on this ship. If the Thomasson Equations were used, he would certainly be put out of work. To a man like that, it would be worse than death. And remember, he has not been in this room since we asked Oscar to point out the killer."

"You might be right," said Horitz slowly. "But even if Oscar put the finger on him, it wouldn't prove anything unless we can find out what 

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