C. S. Lewis is one of the most influential and beloved Christian writers of the past century, and interest in him continues to grow as books about his fantasy, fiction, and biography continue to appear. Although Lewis's personal journey was a deeply philosophical search for the most adequate worldview, the few extant books about his Christian philosophy focus on specific topics rather than his overall worldview. In this book, Michael Peterson develops a comprehensiveframework for understanding Lewis's Christian worldview--from his arguments from reason, morality, and desire to his ideas about Incarnation, Trinity, and Atonement.