A strong open, and a big idea, is undone by a weak ending.

As usual, Wyndham takes a simple premise and peels it apart to tease out contradictions and consquences invisible from the surface. Buried within the prose are occasional aphorisms that apply nicely to our current predicaments. But, by far, the most striking aspect of this book, published in 1960, is how it reflects (and supports) that era's nascent feminist wave. Worth a read, even though it waters out in the last act.