This is a brilliant book full of insight. It contemporizes Jung's theory by doing a fantastic job of removing the outdated links between masculine and feminine principles and biology and gender. This book has given me fresh insight into Jung and enabled me to make much more sense of the masculine and feminine energies as they manifest themselves in each of us, male and female, throughout our lives.
In this book Jungian Gareth Hill suggests a new model for understanding the male/female dynamics of the psyche and given the inadequacies of the existing Jungian model, one can understand why he thought it necessary. However the book dates from 1992 and since then his model hasn't been adopted by any non Jungian psychoanalytical schools and I've never come across it in any Jungian books either, Draw your own conclusions from that.
The concept he proposes is rather New Agey, though it has to be said with a great deal more sincerity and integrity than is usual in that genre. It's all right as far as it goes, particularly if you find abstract theoretical musings interesting but it's all too airy-fairy for my tastes. He describes some fascinating case studies but never delivers the knockout punch that resolves the issues he describes. Instead he has a self-referential tendency to reach for his own theory, go off at a tangent and waffle. And boy can he waffle.
There's some good stuff in the book but in the end it tried my patience just too much.