Readers who can quote word for word from C.S. Lewis’s theological classic, Mere Christianity, or his science fiction novel, Perelandra, have often never read his work as a professional literary historian. They may not even recognize some of the neglected works discussed, here. Mark Neal and Jerry Root have done students of Lewis a great service, tracing the signature ideas in Lewis’s works of literary criticism and showing their relevance to Lewis’s more familiar books. Their thorough research and lucid prose will be welcome to all who would like to understand Lewis more fully, but who feel daunted by books of such evident scholarly erudition. For example, when you read The Discarded Image on the ancients’ view of the heavens, you understand better why Ransom has such unpleasant sensations when first descending toward Malacandra in Out of the Silent Planet. And when you come across Lewis’s discussion in OHEL of a minor sixteenth-century po