This is my favorite in the trilogy and, given its thematic intent, it was probably the most challenging achievement from a literary perspective. In dealing with the introduction of evil into an otherwise pristine environment, Lewis combines his usual wit and humor with a somber consideration of the enormity of God's gift to his creatures, the gift of being coupled with the responsibility of faith in His sovereignty. This is not to say that the book reads like a theological tract. Far from it. But it is the grandeur of our relationship with our God which the story portrays so successfully that ultimately takes our breath away.