Assassin

Excerpt-Strange, he mused, how events conspire to change a man's career. Seven years ago he had been a respected and important member of that far different sort of crowd which had welcomed the visitors from space. That was a human crowd--half afraid, wholly curious, jostling, noisy, pushing--a teeming swarm that clustered in a thick disorderly ring around the silver disc that lay in the center of the International Airport overlooking Puget Sound. Then--he could have predicted his career. And none of the predictions would have been true--for none included a man with a rifle waiting in a blind for the game to approach within range....
The Aztlan ship had landed early that July morning, dropping silently through the overcast covering International Airport. It settled gently to rest precisely in the center of the junction of the three main runways of the field, effectively tying up the transcontinental and transoceanic traffic. Fully five hundred feet in diameter, the giant ship squatted massively on the runway junction, cracking and buckling the thick concrete runways under its enormous weight.