Three strange children -- two superhuman geniuses and a furry monster -- are born of moon explorers who've stumbled on the seeds of a high galactic culture. The ""moon children"" hurry to construct the special space terminal that will bring the starships of their race to instruct a threatened earth in her contacts with the life-forms of the sister planets. A basically routine intergalacticintelligence fantasy enlivened by intricate plotting and ancient mythic themes.