"Light penetrates it," he said. "Matter penetrates it, electricity, all ordinary forces. But this field won't. It's ... well, whatever Craven has is similarly dissimilar. The same thing of opposite nature. It repels our field, but doesn't affect anything else. That means he has analyzed our fields. We have Wilson to thank for this."
Greg nodded gravely. "There's just one thing to be thankful for," he declared. "He probably isn't any nearer our energy than he was before. But now we can't watch him. And that field of his shows that he has tremendous power of some sort."
"We can't watch him, but we can follow him," corrected Russ. "He can't shake us. None of them can. The mechanical shadow will take care of that. I have one for Craven with a bit of 'bait' off his spectacles and he'll keep those spectacles, never fear. He's blind as a bat without them. And we can track Chambers with his ring."
"That's right," agreed Greg, "but we've got to speed up. Craven is getting under way now. If he does this, he can do something else. Something that will really hurt us. The man's clever ... too damn clever."
CHAPTER SIXTEEN
A miracle came to pass in Ranthoor when a man for whom all hope had been abandoned suddenly appeared within the city's streets. But he appeared to be something not quite earthly, for he did not have the solidity of a man. He was pale, like a wraith from out of space, and one could see straight through him, yet he still had all the old mannerisms and tricks.
In frightened, awe-stricken whispers the word was spread ... the spirit of John Moore Mallory had come back to the city once again. He bulked four times the height of a normal man and there was that singular ghostliness about him. From where he had come, or how, or why, no one seemed to know.
But when he reached the steps of the federation's administration building and walked straight through a line of troopers that suddenly massed to bar his way, and when he turned on those steps and spoke to the people who had gathered, there was none to doubt that at last a sign had come. The sign that now, if ever, was the time to avenge the purge. Now the time to take vengeance for the blood that flowed in gutters, for the throaty chortling of the flame guns that had snuffed out lives against a broad steel wall.