Which C.S. Lewis book uses the fictional figure of Screwtape to discuss temptation?

The Screwtape Letters uses the fictional demon Screwtape to discuss temptation.

Published in book form in 1942, the work consists of letters from Screwtape, a senior demon, to his inexperienced nephew Wormwood. The letters offer advice on tempting a human patient, but their ironic perspective exposes the habits and rationalizations that Lewis believed could draw people away from goodness.

Lewis first published the letters as a series in the Anglican newspaper The Guardian in 1941. He later revised and collected them as a book. The epistolary format allows him to present moral instruction through satire rather than direct theological exposition.

A common mistake is to treat Screwtape’s advice as Lewis’s own viewpoint. The demon’s claims are deliberately presented as the perspective being criticized, and the book’s irony depends on that distinction.