The book's publisher notes that, "This study of his [C.S. Lewis's] 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 S. 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." Some of the books discussed include the seven Chronicles of Narnia, the three volume Space Trilogy, Till We Have Faces, The Great Divorce, The Pilgrim's Regress, Surprised by Joy, The Four Loves, Letters to Malcolm: Chiefly on Prayer, Miracles, The Screwtape Letters, The Problem of Pain, Mere Christianity, and Reflections on the Psalms.
I found this fine volume to be most enlightening, a helpful companion to understanding the things Lewis wrote about. It is less than 200 pages long, practical, insightful, and definitely worth obtaining whether you are just being introduced to the works of C.S. Lewis or have been reading him for many years.