The three astronauts from Seeker Two have returned from investigating the crash of their predecessor mission on the lunar farside. They found some odd black tetrahedral crystal grit, which they brought back and which triggered a sequence of unsettling events. Firstly, the three astronauts' wives became pregnant. Two delivered premature but fully formed and recognisably human children. The third delivered an almost-chimera, bearlike but human. All three developed uncannily fast and with abilities not seen in children. Secondly, the removal of the grit apparently signalled extrasolar entities that we may be ready to join a vast conglomeration of intelligences. But the military see envoys that can't easily be stopped differently. A war begins between the Jovian snakes and the metallic ants and other odd space biocosms. Meanwhile a rift has developed between the bearlike Guy and his fellow Moon children, Nick and Kyrie. Guy has developed a way of using the power of the crystal to create something rather amazing which he calls a nexoid, but his real father, who dislikes his child, and his uncle (the viewpoint character who is fond of Guy) have different ideas about how to use this power. Guy has established a country of women, which he is getting pregnant as fast as possible to extend the inherited powers. Ultimately the goal is to build an intergalactic beacon but time is running out. Jack Williamson has written much better books than this, which is a bit of a mish-mash, and reads like it was written in the 1950s.