Space Colony One Books 7 - 9 - Space Colony One Series, #3

Revenge works both waysWhen 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 arrive? And will they make it back in time to avert a disaster?So begins the final part of the epic space colonization adventure, Space Colony One.