Dr. Michael Ward, award-winning author of Planet Narnia: The Seven Heavens in the Imagination of C.S. Lewis and The Narnia Code: C.S. Lewis and the Secret of the Seven Heavens, discusses his best-selling books and thesis about the secret theme that lies behind and which knits together all of the seven books in The Chronicles of Narnia. Dr. Ward also discusses with Drs. Crystal and David Downing his role and the story behind the memorial for C.S. Lewis placed in Poets' Corner in Westminster Abbey on the 50th anniversary of Lewis's death.