What was the title of C.S. Lewis’s 1942 book written from a senior demon’s viewpoint?

C.S. Lewis’s 1942 book written from a senior demon’s viewpoint is The Screwtape Letters.

The book is structured as a series of letters from Screwtape, an experienced demon, to his inexperienced nephew Wormwood. Screwtape offers advice on tempting a human subject, but his instructions expose the distortions and self-deceptions behind demonic thinking.

Lewis used the fictional correspondence to discuss Christian morality, temptation, pride, distraction, and spiritual discipline. The unusual viewpoint lets readers see ordinary human weaknesses from the perspective of an enemy who misunderstands goodness.

The Screwtape Letters first appeared in Britain in 1941 and was published in book form in 1942. It remains one of Lewis’s most widely read works of Christian apologetics, even though it is presented as satire and imaginative fiction rather than as a conventional theological treatise.