I'm writing this review of Darwin's Children, but it actually applies to both that work, and the one preceeding it, Darwin's Radio. Both are great science fiction stories that go beyond the genre, and would interest fans of human-interest fiction as well. The novels deal with an iconoclastic evolutionary theory (turning out to be right in the story, of course) which challenges the neo-Darwinian scenario of a slow process of natural selection taking place over eons. In the new theory, very briefly, portions of the "junk DNA" in organisms, including humans, can respond to sufficient stresses in the environment to bring about a new genotype in the off-spring of a species at a very rapid rate. The story deals with the effects on society and the individuals involved, when increasing numbers of these upgrade humans are born.
The trauma faced by society as a whole, who's leaders mistakenly believe that these children pose a disease risk to the society, is exceeded by that of the parents, who find their children forcibly taken away from them, often without any follow-up word on where they are, or what their condition is. And the new children themselves have to deal with a world that seems to resent their existance, forced into concentration camp type "schools", and kept there even after evidence clearly indicates there is no danger, for reasons of political expediency.
The two main characters, Kaye and Mitch, and their daughter Stella, one of the Homo Sapiens Novus, contend with forces seemingly beyond their control, trying to keep their family together, and to help bring about a more humane response to the new type of human being in our midst. The story,again including both books, is genetically informative, suspensful, and very moving. Get both books and read them as a single work. I highly recommend both of them!