tars--but at a fantastic price.

Interstellar exploration, colonization, and trade became things of
reality. The benefits to Earth were enormous. But because of the
Fitzgerald Contraction, a man who shipped out to space could never live
a normal life on Earth again.

Travelling at speeds close to that of light, spacemen lived at an
accelerated pace. A nine-year trip to Alpha Centauri and back seemed to
take only six weeks to men on a spaceship. When they returned, their
friends and relatives had aged enormously in comparison, old customs had
changed, even the language was different.

So they did the only thing they could do. They formed a guild of
Spacers, and lived their entire lives on the starships, raised their
families there, and never set foot outside their own Enclave during
their landings on Earth. They grew to despise Earthers, and the Earthers
grew to despise them in turn. There was no logical reason for it, except
that they were--different. That was enough.

But not all Starmen liked being different. Alan Donnell loved space, and
the ship, and life aboard it. His father, Captain of the VALHALLA, lived
for nothing but the traditions of the Spacers. But his twin brother,
Steve, couldn't stand it, and so he jumped ship.

It had happened only a few weeks before, as Alan experienced it. For
Steve, though, he knew it would have been nine years in the past. Now,
while Alan was still only 17 years old, Steve would be 26!

Thinking about it got under Alan's skin, finally. The bond between twins
is a strong one, and Alan couldn't stand to see it broken so abruptly
and permanently. There were other things, too. If Alan remained on the
VALHALLA, he'd have to marry one of the girls of the ship, and the
choice of those his own age was pitifully small. And above all else, he
was convinced that the secret of the Cavour Hyperdrive was hidden
somewhere on Earth--the Cavour Hyperdrive, that would enable man to leap
interstellar distances almost instantaneously, and bring an end to the
sharp differences between Earthers and Spacers.

These forces worked quietly within him--and suddenly, without really
meaning to, Alan in turn jumped ship and remained on Earth!

There were many times when he regretted it. He found Earth a bewildering
and utterly hostile place. To stay alive, he had to play a ruthless
game--and he couldn't even find anyone to tell him the rules. Within the
first few hours, he came dangerously close to bein