This book is the first thorough analysis of the whole of Lewis's fiction to show that it has behind it a considerable sophistication of literary technique and patterning. The works discussed include The Pilgrim's Regress, Out of the Silent Planet, Perelandra, That Hideous Strength, The Great Divorce, the Narnia books and Till We Have Faces.
I did not find it especially critical or engaging, and it fell at times like the author was merely repeating the stories written by Lewis. Not a bad read-- but not a particularly outstanding one, either.