Sark shrugged. "There are drugs that do wonderful and terrible things to men's minds. They can force creation or mindless destruction, confession or outrageous subterfuge. You saw your opponents make some use of them. A cardinal, for example, and an engineer, among others. Now you have seen your friend, Dell, as he would have been. Not the same drugs, of course, but the end result is the same." Curt's horror turned to stubborn disbelief. "America wouldn't use such methods," he said flatly. "Today? No," agreed Sark. "But when a country is committed to inhuman warfare--even though the goal may be honorable--where is the line to stop at? Each brutality prepares the way for the next. Even concentration camps and extermination centers become logical necessities. You have heard your opponents say that the end justifies the means. You have seen for yourself--the means become the end." "But Dell could have escaped," Curt protested. "You could have helped him to your own time or another. He was still valuable. He needn't have died!" "There is no such thing as actual travel in time," explained Sark. "Or at least in our day we have found none. There is possible only a bending back of a branch of the Prime Continuum so that we can witness, warn, instruct, gain aid in saving the future. And there can be meeting only in this narrow sector of unreality where the branch joins the main stream. Our farms adjoin such sectors, but farther than that we cannot go, nor can one of you become a citizen of the world you have created for us. "But I wish it were so!" Sark bit out venomously. "We'd kidnap you by the millions, force you to look upon the ruin and the horror, let you breathe the atmosphere that no man can inhale and live, the only atmosphere there is in that world. Yes, I wish you could become our guests there. Our problem would be easier. But it can't be done. This is the only way we can work. "Dell had to go. There was no escape for him, no safety for us if he lived. He would have been tracked down, captured like a beast and set to work against his will. It was there in the Prime Continuum. Nothing could cancel it except death, the death that saves a billion lives because he will not produce a toxin deadlier than D. triconus." * * * * * The vengeance in Sark's voice was almost tangible. Involuntarily Curt retreated a step before it. And--almost--he thought he understood these men out of time. "What is there--" he began hoarsely and had to stop. "What is there that I can do?" "We need you to take over Dell's farm. It is of key importance. The list of men he was treating was an extremely vital one. That work cannot be interrupted now." "How can you accomplish anything by operating only here?" Curt objected. "While you stifle our defenses, our enemies are arming to the teeth. When you've made us sufficiently helpless, they'll strike."