This is effectively an essay from C.S. Lewis regarding the concept of a miracle, and the differences between the natural and supernatural. The book is quite profound and complex at times, as Lewis puts across his personal views, mostly regarding how some people do not believe there can be anything beyond the natural world, and talks about the life of Jesus and his purpose, as well as putting all his ideas into a modern concept.
It is not an easy book to read, as you will need to concentrate in order to understand the arguments put forward, but anyone who enjoys philosophy and has an interest in the Christian faith should read this.
Next book: We Could Be Heroes (Ben Dirs and Tom Fordyce)