Lewis's views on the last things — death, judgment, heaven, and hell — can be fruitfully discovered through two key works, "The Weight of Glory" and "The Great Divorce." What we will find is that heaven and goodness are real and solid, while evil and hell are parasitical upon the good.

In the three books that make up Lewis's interplanetary stories, he sought to create a mythopoeic world in which he could retell the Biblical story and point forward to Christ's redemptive work. Lewis also reinforced his commitment to the Medieval Model of the Universe that would teach people to pay attention to the "music of the spheres."

Why in the world did a middle-aged bachelor write children's stories? And what do we make of these stories? This episode offers a description of the Narnia stories as fairy tales, a retelling of history, and an apologetic.

• Beyond Narnia: The Real Life of C.S. Lewis

Was there an implicit additional structure for Lewis's fictional writing, especially the Chronicles of Narnia? Dr. Sean Lucas explores Michael Ward's phenomenal book as well as Lewis's own Discarded Image to find out.

"The Pilgrim's Regress" was Lewis's first imaginative and autobiographical attempt at an apologetic focused on "sweet desire." Dr. Sean Lucas explores connections between it and "Surprised by Joy" and other writings.

Dr. Sean Lucas explores how this book was written, what it was about, and what kind of book it is.