Cosmetic Surgery Classification came next. Here there were more indexes, and there were also charts and slides. There was an agent sitting on a bench looking bored while two female technicians— classified as O&U for Old and Ugly in Malone’s mind—fluttered around him, deciding what disguises were possible, and which of those was indicated for the particular job on hand. Malone waved to the agent, whom he knew very slightly, and went on. He felt vaguely regretful that the FBI couldn’t hire prettier girls for Cosmetic Surgery, but the trouble was that pretty girls fell for the Agents, and vice versa, and this led to an unfortunate tendency toward only handsome and virile-looking disguises. The O&U division was unfortunate, he decided, but a necessity. Chemical Analysis (III) was next. The Chemical Analysis Section was scattered over several floors, with the first stages up above. Division III, Malone remembered, was devoted to nonpoisonous substances, like clay or sand found in boots or trouser cuffs, cigar ashes and such. They were placed on the same floor as Fingerprints to allow free and frequent passage between the sections on the problems of plastic prints, made in putty or like substances, and visible prints, made when the hand is covered with a visible substance like blood, ketchup or glue. Malone found what he was looking for at the very end of the floor. It was the Computer Section, a large room filled with humming, clacking and buzzing machines of an ancient vintage, muttering to themselves as they worked, and newer machines which were smaller and more silent. Lights were lighting and bells were ringing softly, relays were relaying and the whole room was a gigantic maze of calculating and control machines. What space wasn’t filled by the machines themselves was filled by workbenches, all littered with an assortment of gears, tubes, spare relays, transistors, wires, rods, bolts, resistors and all the other paraphernalia used in building the machines and repairing them. Beyond the basic room were other, smaller rooms, each assigned to a particular kind of computer work. The narrow aisles were choked here and there with men who looked up as Malone passed by, but most of them gave him one quick glance and went back to work. A few didn’t even do that, but went right on concentrating on their jobs. Malone headed for a man working all alone in front of a workbench, frowning down at a complicated-looking mechanism that seemed to have neither head nor tail, and prodding at it with a long, thin screwdriver. The man was thin, too, but not very long; he was a little under average height, and he had straight black hair, thick-lensed glasses and a studious expression, even when he was frowning. He looked as if the mechanism were a student who had cut too many classes, and he was being kind but firm with it. Malone managed to get to the man’s side, and coughed discreetly. There was no response. “Fred?” he said.