"The Pilgrim's Regress" by C.S. Lewis

A conversion story written in the form of an allegory. It's based on his own life and it is an interesting "blend" of fiction and non-fiction in that the story is a fiction that comes from a testimony. In my old JP CG, we spent an hour with each person's whole life story before and after they came to know the Lord. It would have been fascinating to have told those stories in a fictional form.