It was hardly a month later when Morrow stood in the doorway of the sawmill-workshop, his arm around Gwyn, and said, "We need a good mechanical engineer! Can't get anywhere without him—"

And a small, gray-haired man sat up in bed, a few nights later, and stared at the two strange creatures standing before him. Their heads were dark, featureless globes. Their bodies were covered with a bright, shimmering skin. He noted vaguely that the female of the species was stacked quite well.

"Can't do anything without a good structural engineer!" the little man snapped angrily, a few months later, as they were standing around a littered workbench.

A slender, middle-aged woman stepped off the bus and walked up the quiet, dark street toward her home. Then she froze, a scream stuck in her throat, as several weird creatures swarming out of the shadows....

A Northern Airlines pilot glanced out at the port wing of the giant, humming stratoliner. His mouth fell open, then he grabbed his co-pilot's shoulder and pointed out toward the wingtip.

Two sleek, fish-like little ships were flying perfect formation with the big plane, their black silhouettes outlined sharply in the warm summer moonlight.

An Air Force pilot rode his powerful, deadly jet-fighter across the desert country, thinking of the wife and children waiting for him in Los Angeles. Suddenly, he tensed, staring over the side. Far below, a black shape was outlined against the gray earth.

Quickly, the pilot radioed his flight h.q. and fired his guns, blasting their muzzle-covers away. Then he peeled over into a dive and went screaming downward. The black shape appeared on his sights, his thumb pressed the fire-button—no time to set up for auto-fire—

And then, the black shape was gone!

The wind stopped screaming around the little ship as Smitty cut its gravitors back in, halting its helpless plunge. He pointed its needle-nose up the black maw of a deep canyon and glanced upward, grinning as he thought what must be going through that jet jockey's mind. Which way'd he go?