A great introduction to C. S. Lewis, Narnia and many of his major works, filled with plenty of information presented in a simple format. For more in-depth biographies and studies, consult the complete bibliography in the back.
Section of Lewis' life from childhood to death, his career and personal relationships. Then on Narnia, The Great Divorce (very helpful to me), Problem of Pain, Till We Have Faces, the Space Trilogy, Mere Christianity and it touches on his views upon politics, marriage, sex, love, life, justice, etc.
Well worth a read or to have as a reference material.
My favorite was Chapter 5: Tour de Narnia: Themes and Literary Approaches.