Less than a year after his conversion, C.S. Lewis wrote The Pilgrim's Regress in only two weeks while visiting his friend Arthur Greeves in Ireland. Lewis's thick landscape of literary allusions, quotes, and philosophical criticism has long thwarted interested readers. In this week's episode, Drs. Crystal and David C. Downing sit down with Producer Aaron Hill to pull back the curtain on Lewis's allegorical apology of Christianity, reason, and romanticism.