If you are a Christian or just a fan of C.S. Lewis, THIS is essential reading. I do not think I could spoil anything about this book that has not already been said. To listen to an apparition of evil discuss morality in such a perverse and clinical way is fascinating, and it further shows the intelligence of Mr. Lewis. I recommend this book to ANYONE who is a fan of the genre and honestly wants an interesting take of the morality of good and evil through the lense of one of England's most philosophical Christian minds.
Spend the credit. You won't regret it.