Three minutes later, the mirror showed him a dark-skinned stranger with high cheek bones, heavy jaw, thick nose, slightly slanted eyes, graying hair. Halder disposed of the mirror, the clothes he had been wearing and the remaining contents of the second package. Unchecked, the alien organisms swarming in his blood stream now would have gone on to destroy him in a variety of unpleasant ways. But with their work of disguise completed, they were being checked. He emerged presently from a tube exit in uptown Draise, on the terrace of a hotel forty stories above the street level. He didn't look about for Kilby, or rather the woman Kilby would turn into on her way here. The plan called for him to arrive first, to make sure he hadn't been traced, and then to see whether she was being followed. She appeared five minutes later, a slightly stocky lady now, perhaps ten years under Halder's present apparent age, dark-skinned as he was, showing similar racial characteristics. She flashed her teeth at him as she came up, sloe eyes flirting. "Didn't keep you waiting, did I?" she asked. Halder growled amiably, "What do you think? Let's grab a cab and get going." Nobody had come out of the tube exit behind her. Kilby nodded understandingly; she had remembered not to look back. She was talking volubly about some imaginary adventure as they started down the terrace stairs towards a line of aircabs, playing her part, high-piled golden hairdo bobbing about. A greater contrast to the slender, quiet, gray-eyed girl, brown hair falling softly to her shoulders, with whom Halder had talked not more than twenty minutes ago would have been difficult to devise. The disguises might have been good enough, he thought, to permit them to remain undetected in Draise itself. But the plan didn't call for that. There were too many things at stake. Kilby slipped into the cab ahead of him without a break in her chatter. Her voice stopped abruptly as Halder closed the cab door behind him, activating the vehicle's one-way vision shield. Kilby was leaning across the front seat beside the driver, turning off the comm box. She straightened, dropped down into the back seat beside Halder, biting her lip. The driver's head sagged sideways as if he had fallen asleep; then he slid slowly down on the seat and vanished from Halder's sight. "Got him instantly, eh?" Halder asked, switching on the passenger controls. "Hm-m-m!" Kilby opened her purse, slipped the little gun which had been in the palm of her left hand into it, reached out and gripped Halder's hand for an instant. "You drive, Halder," she said. "I'm so nervous I could scream! I'm scared cold! What happened?" * * * * *