C. S. Lewis was one of the twentieth century's foremost Christian authors -- at once a scholar, a teacher, a social critic, an amateur yet profound theologian, and an apologist. This study of his writings provides a perceptive and illuminating guide to readers who may be unacquainted with Lewis; a help to those wishing to understand him better; and an evaluation for those who want a survey of his works as a whole. Clyde Kilby examines Lewis's Christian works one by one, compares them with each other and with books by other authors, and discovers and elucidates the themes that recur throughout the main body of Lewis's writings.