The siren wail of the police car cut into his thoughts and Paul raced to the door to fling it open. The car slid to the curb and the siren whined down the scale as the driver turned it off. They got out of the car and came up the walk briskly. "Hurry!" he called. He cast a glance over his shoulder at the standard clock. He had three minutes. "Tell 'em who I am!" he exploded breathlessly. The sergeant blinked. "But I don't know who you are." "But I've told you." "Hell," grunted the guard. "You've told me, too." To the sergeant, the guard said: "Do you know anything about all this?" "We got a call that this man had been clipped and robbed. He was." The sergeant looked at Nora Phillips. "Can you identify this man?" Nora bit her lip. "He's Paul Grayson." The guard speared Nora with a cold look. "Do you know that or is it just what he said?" "Why I've--" "She's never met him otherwise," put in the sergeant. "That's true, but I think--" "Thinking ain't good enough." Nora looked at Paul. "Haven't you anything to show?" Paul shook his head. "Nothing that would cut any ice. Belt buckle with initial G. A few laundry marks and cleaners' marks. A checkbook in my hip pocket but no name printed in it. I might check the balance against the bank, but that would be tomorrow morning. We might call Doctor Haedaecker, but by the time we arrived on some means of personal identification, take-off time would be gone and past." Paul paused, breathless, his whole body poised tense and his head bent to listen. There came the patter of feet outside. The standard clock was swinging towards the hour, two minutes remained, enough if all went quick and well. One of the guards burst in. He took a quick look around and spotted the police sergeant. "Good," he said, breathing heavily. "We've just shot a man out there. You're needed." "Was it the man who passed himself off as me?" shouted Paul Grayson. "As we came up to BurAst 33-P.G.1, this guy jumped from the airlock and started to run. We gave chase and lost him in the dark beyond a group of parked spacecraft. We called for him to halt. We found him again on the far side of the ships and Joe fired a shot. "It must of missed him because he kept running, and then we all started shooting, losing him behind another ship parked by the fence. You know old Mupol 3316? The way the guts are parked all over the spaceport and left to rust? A derelict if I ever saw one, and after this I'd say it was about time we cleaned up that old wreck--" "--Please hurry," blurted Paul. "--we got to the fence where he'd climbed out over some junk stacked behind Mupol 3316. We went after him, and then guess what?" "What?" "We found this character flat on his face in the road, as dead a corpse as ever died." Paul exploded again. "That proves it," he said. "Now--" The spaceport guard shook his head. This shake was echoed by the sergeant of police. "But I've work to do--"