What was the title of C.S. Lewis’s 1942 Christian fantasy about a senior demon advising a junior tempter?

The Screwtape Letters is C.S. Lewis’s 1942 Christian fantasy about a senior demon advising a junior tempter.

The book consists of letters from Screwtape, an experienced demon, to his nephew Wormwood, who is assigned to influence a human being. Lewis reverses the expected viewpoint: readers see temptation, distraction, pride, and self-deception described from the perspective of Hell’s bureaucracy.

The satirical form lets Lewis examine ordinary moral failures without presenting a conventional sermon. The letters discuss topics such as vanity, resentment, social pressure, war, prayer, and the misuse of intellectual arguments.

The title character is Screwtape, while Wormwood is the junior tempter receiving the advice. The book’s epistolary structure and ironic tone distinguish it from Lewis’s more direct apologetic works, including Mere Christianity.