Dan studied the numerous slots, went to the General Information section and spent most of his change. He sat down with a small package of maps and folders and soon had before him a cross-sectional drawing showing a series of spherical layers one inside the other, labeled, "Level 1--Retail," "Level 2--Retail," "Level 3--Wholesale," "Level 4--Manufacturing," and so on, numbered from the outside in toward the center of the sphere, from one to twenty-five. Dan sat perfectly still for a moment, looking at this. He leafed carefully though the folders, and was soon convinced that this wasn't a map of underground layers under just one city, but of an interconnected system that appeared to stretch over most of the planet. The surface was labeled, "Recreation--Ordeals--General." The complex of underground layers seemed to be much thicker than separate floors of a building would be; the map showed cross-sections of buildings of many stories in the individual layers. Dan studied the map further and found that Level 10 was marked, "Coordination--Government." Dan walked to the information machine and came back with a general map of Level 10, which was divided into sixteen sections. Sections 4 and 5 were headed "Government Sections," and Dan got large-scale maps of each of them. What he was looking at was being reproduced far away on big screens, and instantly recorded, to be examined in detail by staffs of trained men. He was thankful this was so. The map was a maze of colored lines, blocks, and curves, with numbered lists up and down both sides and across the bottom. Abruptly, Kielgaard's voice said, "Dan, see that dark purple oval a little to the left of the center of the page?" "I see it." Dan glanced from the number to the list at the side of the page and read, "War Ruler's Control Center." * * * * * Kielgaard said, "The staff going over those books thinks there is some sort of an arrangement by which a 'war ruler' takes over absolute power in an emergency. What would be a better way to take over the planet than to get control of this War Ruler and then provoke an emergency?" Dan studied the purple oval on the map. "Yes. But what do we do about it?" "The first of your reinforcements will be coming down tonight. If you can get near that control center and plant a few transceivers, we might be able to make a good deal of trouble for anyone who may have seized it." "I'll do my best," said Dan. He got up, put most of the maps and folders into a locker, and bought a ticket for Level 10, Section 4. As he turned, he noticed two men standing about twenty feet away, talking. On impulse, Dan went, not to the block that would take him to Level 10, but instead toward the station that his pamphlet had told him would take him to Section 6 of the same level he was on. As he rounded a corner and strode up a deserted corridor, he stooped and slid a mataform unit into the space between a waste container and the wall.