by“Adel W. Crane, C.D.” Donovan held the Identi-plast in his hands, the fingers trembling slightly. “What do the letters ‘C.D.’ stand for?” he asked, determined to play the part of an honest citizen who had no interest in unlicensed rejuvenation or time travel. The chalk-faced young man with the fixed smile told him: “Cyclic Detection. You may have heard our more dramatic nickname, Criminal Destroyers; I’ve been an agent since 2452.” High-strung Donovan moistened his lips. Of course he had heard of the C.D. In an age when cyclic travel backward through the centuries was an established science, the Komitet that governed the Home Planet had to employ ruthless measures to cope with any experimenters whose uncontrolled work might threaten to change past temporal cycles. The C.D. were the sca

