No windows broke the four plain walls of the office; no sunlight shone on the desk there. Yet the five disks set out on its surface appeared to glow—perhaps the heat of the mischief they could cause had caused blazed in them. But fanciful imaginings did not change cold, hard fact. Dr. Gordon Ashe, one of the four men peering unhappily at the display, shook his head slightly as if to free his mind of such cobwebs. His neighbor to the right, Colonel Kelgarries, leaned forward to ask harshly: "No chance of a mistake?" "You saw the detector." The thin gray man behind the desk answered with chill precision. "No,.
