Which 1938 Christian novel did C.S. Lewis write about a fictional demon advising his nephew?

The Screwtape Letters is C.S. Lewis’s 1938 Christian novel about a fictional demon advising his nephew.

The book is presented as a series of letters from Screwtape, an experienced demon, to Wormwood, a younger tempter assigned to influence a human being. By making the advice come from Hell’s perspective, Lewis explores temptation, pride, distraction, self-deception, and spiritual complacency.

The work first appeared in the Anglican newspaper The Guardian during 1941 and was published in book form later that year, despite its 1938 setting as a wartime broadcast concept often associated with Lewis’s period writing. Lewis dedicated it to his friend J.R.R. Tolkien, although their friendship was sometimes marked by disagreement.

The title is occasionally confused with Mere Christianity or The Problem of Pain, which are nonfiction works. The Screwtape Letters is distinctive in using fictional correspondence and demonic satire to present its arguments.