McNeil shook his head. "Our cover wasn't broken that way. Sanford was a wonder. If I hadn't known better, I would have sworn he was born one of the Beaker folk. He had a network of informants running all the way from here into Brittany. Amazing how he was able to work without arousing any suspicions. I suppose his being a member of the smiths' guild was a big help. He could pick up a lot of news from any village where there was one at work. And I tell you," McNeil propped himself up on his elbow to exclaim more vehemently--"there wasn't a whisper of trouble from here clear across the channel and pretty far to the north. We were already sure the south was clean before we ever took cover as Beakers, especially since their clans are thick in Spain." Ashe chewed a broiled wing reflectively. "Their permanent base with the transport _has_ to be somewhere within the bounds of the territory they hold in our own time." "They could plant it in Siberia and laugh at us," McNeil exploded. "No hope of our getting in there----" "No." Ashe threw the stripped bone into the fire and licked grease from his fingers. "Then they would be faced with the old problem of distance. If what they are exploiting lay within their modern boundaries, we would never have tumbled to the thing in the first place. What the Reds want must lie outside their twentieth century holdings, a slender point in our favor. Therefore they will plant their shift point as close to it as they can. Our transportation problem is more difficult than theirs will ever be. "You know why we chose the arctic for our base; it lies in a section of the world never populated by other than roving hunters. But I'll wager anything you want to name that their point is somewhere in Europe where they have people to contend with. If they are using a plane, they can't risk its being seen----" "I don't see why not," Ross broke in. "These people couldn't possibly know what it was--Lurgha's bird--magic--" Ashe shook his head. "They must have the interference-with-history worry as much as we have. Anything of our own time has to be hidden or disguised in such a way that the native who may stumble upon it will never know it is man-made. Our sub is a whale to all appearances. Possibly their plane is a bird, but neither can bear too close an examination. We don't know what could result from a leak of real knowledge in this or any primitive time ... how it might change history----" "But," Ross advanced what he believed to be the best argument against that reasoning, "suppose I handed Lal a gun and taught him to use it. He couldn't duplicate the weapon--the technology required lies so far beyond this age. These people couldn't reproduce such a thing."