Return of the Sagan - Neil O'Donnell - Bog

The USS Carl Sagan blasted off from an overpopulated Earth in search of survival. Three centuries later, descendants of the Sagan's first crew return to find Earth void of human life and all Humanity's footprints in ruin. Upon landing, the Sagan's crew struggles to uncover the mystery behind their ancestors' disappearance while once extinct alpha-predators on the planet and political operatives on the Sagan maneuver for ultimate control of the planet's future.