One of Lewis's earlier works, this book is a similar parable to Bunyan's "The Pilgrim's Progress"; while "Pilgrim's Progress" describes the journey of a non-Christian coming into Christianity, "The Pilgrim's Regress" describes the journey of a man from a Christian background leaving Christianity and then coming back again. As Lewis takes us through this abstract tale, we are left wondering what our lives truly mean, both in the small ways and on a much greater scale.