Space Colony One Books 7 - 9

Revenge works both ways

When humanity's first deep-space colonists touched down on their new planet, they had no idea it was the birthplace of a hostile alien species.

After enduring numerous attacks, the survivors realize the aliens are about to get their revenge by invading Earth.

The colonists build a starship to journey to the homeworld and warn the inhabitants of the impending war.

Generations have passed since the original colony ship departed Earth. What will the returners find when they...