Which C.S. Lewis book presents advice from a demon to his junior tempter?

The Screwtape Letters presents advice from a demon to his junior tempter. C.S. Lewis’s epistolary Christian satire was published in book form in 1942.

The senior demon Screwtape writes letters to his nephew Wormwood, who is trying to tempt a human being. The letters reverse ordinary moral instruction by presenting demonic strategies as if they were professional advice.

Lewis uses the device to examine temptation, distraction, pride, fear, and self-deception. Because Screwtape is the speaker, the book’s claims are deliberately framed through irony; readers must recognize that the demonic viewpoint is not Lewis’s own voice.

The work began as a series of letters published in the Anglican newspaper The Guardian in 1941. Lewis later expanded the material into a book. Its unusual format helped make it one of his most widely read works of Christian apologetics.