Which 1942 book by C.S. Lewis presents advice from a senior demon to a junior tempter?

C.S. Lewis’s 1942 book presenting advice from a senior demon to a junior tempter is The Screwtape Letters.

The book consists of letters from Screwtape, an experienced demon, to his nephew Wormwood. Screwtape advises Wormwood on how to tempt a human known as “the Patient.” Lewis reverses the usual viewpoint of religious writing by describing spiritual life from the imagined perspective of Hell.

The letters first appeared in the Anglican newspaper The Guardian during 1941, before being collected as a book in 1942. Lewis later dedicated the work to his friend J.R.R. Tolkien, though Tolkien reportedly disliked the book’s format and subject matter.

The satire addresses distraction, pride, social pressure, self-deception, and routine moral compromise. Its fictional demonic vocabulary can make readers miss that the book is fundamentally a set of observations about ordinary human behavior rather than a narrative about a conventional battle scene.