Which C.S. Lewis book presents a conversation between a narrator and a demon named Screwtape?

The Screwtape Letters is the C.S. Lewis book built around letters from the demon Screwtape to his inexperienced nephew, Wormwood.

Lewis wrote the work as a satirical series of fictional instructions about temptation. Screwtape serves as a senior tempter, advising Wormwood on how to distract a human being from faith, moral responsibility, and attention to ordinary life. The structure lets Lewis discuss spiritual and psychological habits from an deliberately inverted perspective.

The book was first published in Britain in 1942 and became one of Lewis’s best-known Christian works. It began as a series in the Anglican newspaper The Guardian before appearing in book form. Lewis later said that writing in Screwtape’s voice was unpleasant and that he did not want to return to the character.

The title is sometimes confused with Lewis’s other imaginative theological fiction, especially The Great Divorce. Unlike that later allegorical journey, The Screwtape Letters uses correspondence between demons as its central literary device.