"Perhaps I can help out in your war."

"Perhaps but you've already done more than anyone here by what you've enabled me to do. We are working on it now." He swung his arm in a gesture which took in the whole room.

Igor had been detached from combat duty and assigned to staff work, in order to make available earth techniques. Helen was helping. "Nobody believes my story but my sister," he admitted, "But I've been able to show them enough for them to realize that what I've got is important, so they've given me a free hand and are practically hanging over my shoulder, waiting to see what we can produce. I've already got them started on a jet fighter and attack rockets to arm it."

Frost expressed surprise. How could so much be done so fast? Were the time rates different? Had Helen and Igor crossed over many weeks before, figured along this axis?

No, he was told, but Igor's countrymen, though lacking many earth techniques, were far ahead of earth in manufacturing skill. They used a single general type of machine to manufacture almost anything. They fed into it a plan which Igor called for want of a better term the blueprints it was in fact, a careful scale model of the device to be manufactured; the machine retooled itself and produced the artifact. One of them was, at that moment, moulding the bodies of fighting planes out of plastic, all in one piece and in one operation.

"We are going to arm these jobs with both the stasis ray and rockets," said Igor. "Freeze 'em and then shoot the damn things down while they are out of control."

They talked a few minutes, but Frost could see that Igor was getting fidgety. He guessed the reason. and asked to be excused. Igor seized on the suggestion. "We will see you a little later," he said with relief. "I'll have some one dig up quarters for you. We are pretty rushed. War work I know you'll understand."

Frost fell asleep that night planning how he could help his two young friends, and their friends, in their struggle.

But it did not work out that way. His education had been academic rather than practical; he discovered that the reference books which Igor and Helen had brought along were so much Greek to him worse, for he understood Greek. He was accorded all honor and a comfortable living because of Igor's affirmation that he had been the indispensable agent whereby this planet had received the invaluable new weapons, but he soon realized that for the job at hand he was useless, not even fit to act as an interpreter.

He was a harmless nuisance, a pensioner and he knew it.

And underground life got on his nerves. The everpresent light bothered him. He had an unreasoned fear of radioactivity, born of ignorance, and Igor's reassurances did not stifle the fear. The war depressed him. He was not temperamentally cut out to stand up under the nervous tension of war. His helplessness to aid in the war effort, his lack of companionship, and his idleness all worked to increase the malaise.

He wandered into Igor and Helen's workroom one day, hoping for a moment's chat, if they were not too busy. They were not. Igor was pacing up and down, Helen followed them with worried eyes.

He cleared his throat"Uh I say, something the matter?"

Igor nodded, answered, "Quite a lot," and dropped back into his preoccupation.

"It's like this," said Helen. "In spite of the new weapons, things are still going against us. Igor is trying to figure out what to try next."

"Oh, I see. Sorry." He started to leave.

"Don't go. Sit down." He did so, and started mulling the matter over in his mind. It was annoying, very annoying!

"I'm afraid I'm not much use to you." he said at last to Helen. "Too bad Howard Jenkins isn't here."

"I don't suppose it matters," she answered, "We have the cream of modern earth engineering in these books."

"I don't mean that. I mean Howard himself, as he is where he's gone. They had a little gadget there in the future called a blaster. I gathered that it was a very powerful weapon indeed."

Igor caught some of this and whirled around. "What was it? How did it work?"

"Why, really," said Frost, "I can't say. I'm not up on such things, you know. I gathered that it was sort of a disintegrating ray."

"Can you sketch it? Think, man, think!"

Frost tried. Presently he stopped and said, "I'm afraid this isn't any good. I don't remember clearly and anyhow I don't know anything about the inside of it."

Igor sighed, sat down, and ran his hand through his hair.

After some minutes of gloomy silence, Helen said, "Couldn't we go get it?"

"Eh? How's that? How would you find him?"

"Could you find him. Professor?"

Frost sat up. "I don't know," he said slowly, " but I'll try!"

There was the city. Yes, and there was the same gate he had passed through once before. He hurried on.

Star Light was glad to see him, but not particularly surprised. Frost wondered if anything could surprise this dreamy girl. But Howard more than made up for her lack of enthusiasm. He pounded Frost's back hard enough to cause pleurisy. "Welcome home, Master! Welcome homel I didn't know whether or not you would ever come, but we are ready for you. I had a room built for you an4 you alone, in case you ever showed up. What do you think of that? You are to live with us, you know. No sense in ever going back to that grubby school."

Frost thanked him, but added, "I came on business. I need your help, urgently."

"You do? Well, tell me, man, tell me!"

Frost explained. "So you see, I've got to take the secret of your blaster back to them. They need it. They must have it."

"And they shall have it," agreed Howard.

Some time later the problem looked more complicated. Try as he would Frost was simply not able to soak up the technical knowledge necessary to be able to take the secret back. The pedagogical problem presented was as great as if an untutored savage were to be asked to comprehend radio engineering sufficiently to explain to engineers unfamiliar with radio how to build a major station. And Frost was by no means sure that he could take a blaster with him through the country of Time.

"Well," said Howard at last, "I shall simply have to go with you."

Star Ught, who had listened quietly, showed her first acute interest. "Darling! You must not "

"Stop it," said Howard, his chin set stubbornly. "This is a matter of obligation and duty. You keep out of it."

Frost felt the acute embarrassment one always feels when forced to overhear a husband and wife having a difference of opinion.

When they were ready. Frost took Howard by the wrist. "Look me in the eyes," he said, "You remember how we did it before?"

Howard was trembling. "I remember. Master, do you think you can do it and not lose me?"

"I hope so," said Frost, "now relax."

They got back to the chamber from which Frost had started, a circumstance which Frost greeted with relief. It would have been awkward to have to cross half a planet to find his friends. He was not sure yet just how the spatial dimensions fitted into the time dimensions. Someday he would have to study the matter, work out an hypothesis and try to check it.

Igor and Howard wasted little time on social amenities. They were deep into engineering matters before Helen had finished greeting the professor.

At long last "There," said Howard, "I guess that covers everything. I'll leave my blaster for a model. Any more questions?"

"No," said Igor, "I understand it, and I've got every word you've said recorded. I wonder if you know what this means to us, old man? It unquestionably will win the war for us."

"I can guess," said Howard. "This little gadget is the mainstay of our systemwide pax. Ready, Doctor. I'm getting kinda anxious,"

"But you're not going, Doctor?" cried Helen. It was both a question and a protest.