This is a lovely memoir which is half love story, one quarter faith story, and one quarter story about the author's exchange of letters with C.S. Lewis. The most interesting and unique aspect of the book was Vanauken's description of the oneness that he and his wife carefully planned and largely realized for a while. They called the concept the Shining Barrier--their way of living which would guard their love above all else because any sort of separation could constitute a wedge between them.