Human-alien encounters, Space colonies 

n Gateway, long after the alien Heechee abandoned their space-station, Gateway (as humans dubbed it) allowed humans to explore new worlds. The Heechee, alarmed by the alien Kugel whose goal was to destroy all organic lifeforms, had already retreated to the galactic core where they now lived in peace. Now, in The Boy Who Would Live Forever, humans with dreams of life among the stars are joining the Heechee at the core, to live there along with those humans and Heechee whose physical bodies have died and their minds stored in electronic memory so that their wisdom passes down through the ages.

Their peace is threatened by the Kugel, who may yet attack the core. But a much greater threat is the human Wan Enrique Santos-Smith, whose blind loathing of the Heechee fuels an insane desire to destroy them and, incidentally, every living being in the galaxy.