Several years ago while teaching a fantasy literature course, I discovered an interesting relationship between the seven deadly sins and C. S. Lewis' Chronicles of Narnia. As I was giving an overview of the seven Narnian tales, it struck me that Lewis, a medieval scholar, had an intimate knowledge of the seven deadly sins. I remember suggesting that someone ought to study the relationship between the tales and the sins, intending of course that one of my students do so. I did not realize then that most were ill-equipped to tackle such a task. Thus, it has fallen to me in this paper to explore the nature of this relationship.