Which C.S. Lewis work uses the fictional demon Screwtape to advise his nephew Wormwood?

The Screwtape Letters uses the fictional demon Screwtape to advise his nephew Wormwood. C.S. Lewis wrote the book as a series of letters from an experienced tempter to a junior demon assigned to influence a human being.

The epistolary format lets Lewis reverse ordinary moral instruction. Screwtape’s advice is presented from the viewpoint of Hell, allowing Lewis to satirize self-deception, vanity, distraction, resentment, and spiritual complacency. Readers are expected to infer the moral lesson by recognizing the distortions in Screwtape’s arguments.

The work first appeared in serialized form in the Anglican newspaper The Guardian in 1941 and was published as a book later that year. Lewis dedicated it to his friend J.R.R. Tolkien, although their friendship was not always free of disagreement.

The title is sometimes shortened informally to “Screwtape,” but The Screwtape Letters is the canonical title. It is distinct from The Great Divorce, another Lewis work using an imaginative afterlife setting.