Presents reflections from C.S. Lewis on the virtues and dangers of love. He explores the nature of four Greek words that translate to 'love' in English and shows how easily natural loves can go wrong and pollute our relationships. He also shows that what we tend to excuse as natural behavior can be selfish and destructive, and he leads us to a solution: agape, the kind of God-like love that we should develop and nurture in our relationships.