This book, by the author of the well-known spiritual classic On Having No Head, is a kind of Pilgrim's Progress for the Third Millennium. 

It is also a condensation, in the form of a romantic adventure story, of Harding's major work, The Hierarchy of Heaven and Earth. Concerning which, C. S. Lewis wrote to the author: "Hang it all, you've made me drunk, roaring drunk... My sensation is that you have written a book of the highest genius... Thanks to the nth!"