A thousand years after humans disappeared from Earth, a gleaming monolithic city known as "Eden 3" is inhabited solely by artificially intelligent robots whose former masters vanished long ago although they continue to grow agricultural produce. On a routine assignment on the surrounding farmland two maintenance robots accidentally awaken a human baby girl, Sara Grace, from stasis, questioning their belief that humans were a forbidden ancient myth. Together, the two robots secretly raise Sara in a safe haven outside Eden 3.