C. S. Lewis (Anthony Hopkins), the renowned author of "The Chronicles of Narnia" series, is a bachelor and Oxford University professor who spends his free time debating with fellow academics at a pub. Although he seems entirely uninterested in love, Lewis agrees to marry Joy Gresham (Debra Winger), an American writer who is looking to secure British citizenship. Their arrangement soon becomes a romance, and, when Joy is diagnosed with terminal cancer, their bond grows even stronger.