Honath and his fellow arch-doubters did not believe in the Giants, and for this they were cast into Hell. And when survival depended upon unwavering faith in their beliefs, they saw that there were Giants, after all. . . .

Father Ramon Ruiz-Sanchez S.J., is a part of a four man scientific commission to the planet Lithia, there to study a harmonious society of aliens living on a planets which is a biologist's paradise. He soon finds himself troubled: how can these perfect beings, living in an apparent Eden, have no conception of sin or God? If such a sinless Eden has been created apart from God, then who is responsible? Winner of the Hugo Award for best novel, 1959.

James Blish's galaxy-spanning masterwork, originally published in four volumes, explores a future in which two crucial discoveries - antigravity devices which enable whole cities to be lifted from the Earth to become giant spaceships, and longevity drugs which enable their inhabitants to live for thousands of years - lead to the establishment of a unique Galactic empire.