What is the name of the Christian allegory C.S. Lewis published in 1942?

C.S. Lewis published The Screwtape Letters in 1942.

The Screwtape Letters is an epistolary Christian satire made up of letters from Screwtape, an experienced demon, to his inexperienced nephew Wormwood. The senior demon gives advice about tempting a human being and undermining that person’s spiritual life.

Lewis uses the demonic viewpoint to expose habits such as distraction, vanity, resentment, and self-deception. The book does not present a systematic theology; instead, it uses irony to make readers examine ordinary moral and spiritual choices.

The work first appeared in Britain during the Second World War and became one of Lewis’s best-known religious books. It is distinct from The Great Divorce, another allegorical work, and from The Problem of Pain, which is a direct theological discussion.