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.