They waited. Nothing happened. The wind sighed and the trees creaked. Squirrels chirped, and birds stirred in their nests. An acorn fell to the ground.

Pid heaved a sigh of relief and sat down. The twenty-first Grom expedition had landed safely.

There was nothing to be done until morning, so Pid began to make plans. They had landed as close to the atomic power installation as they dared. Now they would have to get closer. Somehow, one of them had to get very near the reactor room, in order to activate the Displacer.

Difficult. But Pid felt certain of success. After all, the Grom were strong on ingenuity.

Strong on ingenuity, he thought bitterly, but terribly short of radioactives. That was another reason why this expedition was so important. There was little radioactive fuel left, on any of the Grom worlds. Ages ago, the Grom had spent their store of radioactives in spreading throughout their neighboring worlds, occupying the ones that they could live on.

Now, colonization barely kept up with the mounting birthrate. New worlds were constantly needed.

This particular world, discovered in a scouting expedition, was needed. It suited the Grom perfectly. But it was too far away. They didn't have enough fuel to mount a conquering space fleet.

Luckily, there was another way. A better way.

Over the centuries, the Grom scientists had developed the Displacer. A triumph of Identity Engineering, the Displacer allowed mass to be moved instantaneously between any two linked points.

One end was set up at Grom's sole atomic energy plant. The other end had to be placed in proximity to another atomic power source, and activated. Diverted power then flowed through both ends, was modified, and modified again.

Then, through the miracle of Identity Engineering, the Grom could step through from planet to planet; or pour through in a great, overwhelming wave.

It was quite simple.

But twenty expeditions had failed to set up the Earth-end Displacer.

What had happened to them was not known.

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