C. S. Lewis, long renowned for his children's books as well as his Christian apologetics, has been the subject of wide interest since he first stepped-up to the BBC's microphone during the Second World War. Until now, however, the reasons why this medievalist began writing books for a popular audience, and why these books have continued to be so popular, had not been fully explored. The groundbreaking work considers the growth of C. S. Lewis's international fame bycomparing the contrasting patterns of reception in Britain and the USA.