Which 1942 book made C.S. Lewis’s demonic correspondence famous?

The Screwtape Letters is the 1942 book that made C.S. Lewis’s demonic correspondence famous.

The Screwtape Letters is a satirical Christian work presented as a series of letters from Screwtape, an experienced demon, to his inexperienced nephew Wormwood. The letters discuss temptation, distraction, pride, and spiritual confusion from the imagined perspective of Hell’s bureaucracy.

Lewis published the work in book form in 1942 after parts had appeared in the Anglican periodical The Guardian. Its unusual viewpoint allowed Lewis to criticize ordinary human weaknesses indirectly. The book quickly became one of his most popular works and remains widely assigned and discussed.

The title is sometimes confused with Mere Christianity, another influential Lewis book that grew from wartime radio broadcasts. The Problem of Pain is a theological study, while A Grief Observed is a later reflection on bereavement. None uses the demonic-letter format of The Screwtape Letters.