* The Chronicles of Narnia series: A collection of seven fantasy novels, including *The Lion, the Witch, and the Wardrobe*, *Prince Caspian*, and *The Voyage of the Dawn Treader*.
* The Screwtape Letters: A satirical novel about a senior demon named Screwtape who mentors a junior demon named Wormwood on how to tempt a human.
* Mere Christianity: A collection of essays exploring the basics of Christian faith.
* The Problem of Pain: An exploration of the nature of suffering.
* Out of the Silent Planet: The first book in the "Space Trilogy," which explores themes of redemption and the nature of good and evil.
These are just a few of C.S. Lewis's most famous works. He wrote many other books and essays, and his works have influenced readers for generations.